Q: What is the value of n in this equation 2n plus 1 equals 21?

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

5

n + 13 = 21. n = 21 - 13

It is an equation and the value of x is 7

3x + 7 = -4x + 28 implies 7x + 7 = 28

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21

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

5

Zero.

-21

n + 13 = 21. n = 21 - 13

It is an equation and the value of x is 7

It is a symbolic equation which requires triangle = 21.

3x + 7 = -4x + 28 implies 7x + 7 = 28

21

21 is the only solution of that equation.

The value of x is -21.