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Without an equality sign the given terms can't be classed as an equation and so therefore finding the value of x is not possible.

Q: For which value of x is the equation 2(1 plus x) x plus 3 true?

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There is no variable, and the equation is not valid.

21 is the only solution of that equation.

2(10)+1

n + 13 = 21. n = 21 - 13

It can be simplified to: 22+6x or 6x+22But that's only a different, neater way to write it. It's not a 'solution', because"21 + 6x + 1" is not an equation or a question. It's just an expression that standsfor a number. The value of the number depends on the value of 'x'.

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There is no variable, and the equation is not valid.

Zero.

21 is the only solution of that equation.

2(10)+1

It's a simple linear equation in 'a'.If you want to know the value of 'a' that makes the equation true,you can find it as follows:7a + 3 = 21Subtract 3 from each side:7a = 18Divide each side by 7:a = 18/7

If you mean 3n+5 = 21 then the value of n is 16/3

-21

n + 13 = 21. n = 21 - 13

It can be simplified to: 22+6x or 6x+22But that's only a different, neater way to write it. It's not a 'solution', because"21 + 6x + 1" is not an equation or a question. It's just an expression that standsfor a number. The value of the number depends on the value of 'x'.

25x+3x+21 = 32+51+9 Collect all like terms together and notice the change from +21 to -21, this is done in order to keep the equation in balance. 25x+3X = 32+51+9-21 28x = 71 Divide both sides of the equation by 28 to find the value of x: x = 71/28 or 2 and 15/28 x = 2.535714286 as a decimal

It has no solution. Equations have solutions, but expressions have not. Had you asked, 'What is the solution to -2x + 5 + 21 = 0 ?', then I would reply, '26 = 2x; therefore, x = 13', is your solution. You can check this, to see whether it is true. The equation is clearly true, if we substitute 13 for x: -2(13) + 5 + 21 = -26 + 5 + 21 = 0. The moral is that equations are statements and may be true or false. Mere expressions are not statements, and they are therefore neither true or false.

21