7n-9-5n=21

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Solution for 7n-9-5n=21 equation:


Simplifying
7n + -9 + -5n = 21

Reorder the terms:
-9 + 7n + -5n = 21

Combine like terms: 7n + -5n = 2n
-9 + 2n = 21

Solving
-9 + 2n = 21

Solving for variable 'n'.

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

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

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

Combine like terms: 21 + 9 = 30
2n = 30

Divide each side by '2'.
n = 15

Simplifying
n = 15

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