9n-21=-9+7n

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Solution for 9n-21=-9+7n equation:


Simplifying
9n + -21 = -9 + 7n

Reorder the terms:
-21 + 9n = -9 + 7n

Solving
-21 + 9n = -9 + 7n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-7n' to each side of the equation.
-21 + 9n + -7n = -9 + 7n + -7n

Combine like terms: 9n + -7n = 2n
-21 + 2n = -9 + 7n + -7n

Combine like terms: 7n + -7n = 0
-21 + 2n = -9 + 0
-21 + 2n = -9

Add '21' to each side of the equation.
-21 + 21 + 2n = -9 + 21

Combine like terms: -21 + 21 = 0
0 + 2n = -9 + 21
2n = -9 + 21

Combine like terms: -9 + 21 = 12
2n = 12

Divide each side by '2'.
n = 6

Simplifying
n = 6

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