Q: What is an equation for two-thirds a number plus 4 is 7?

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It would be: 2x+4 = 19

its an equation like this x squared plus 4 equals 7 or a number you dont know times itsself plus 4 is 7. What is the number you dont know

You would add 4.

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

It would be: 2x+4 = 19 and the value of x works out as 7.5

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18 is a solution to the equation 4 plus 7 times a number where the result is 9 times that number.

6

Mn increase in oxidation number from +4 to +7.

There is no single coefficient for that equation, as a coefficient is the number by which any term is multiplied. The coefficients in that equation are 5, 2, 4 and 3.

It would be: 2x+4 = 19

its an equation like this x squared plus 4 equals 7 or a number you dont know times itsself plus 4 is 7. What is the number you dont know

The sum of 10 plus -6 is equal to 4. The equation would read 10+-6=4.

You would add 4.

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

x = 0 and y = 4

is an equation of a line in plane coordinate geometry. The coordinates of every point on that line satisfy the equation so there are an infinite number of solutions to the equation.

That equation cannot be solved since there are 2 unknown in the equation (x and y) but only 1 equation. The number of unknowns must be equal to the number of equations (for simultaneous equations)