7n+3-5n=21

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Solution for 7n+3-5n=21 equation:


Simplifying
7n + 3 + -5n = 21

Reorder the terms:
3 + 7n + -5n = 21

Combine like terms: 7n + -5n = 2n
3 + 2n = 21

Solving
3 + 2n = 21

Solving for variable 'n'.

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

Add '-3' to each side of the equation.
3 + -3 + 2n = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 2n = 21 + -3
2n = 21 + -3

Combine like terms: 21 + -3 = 18
2n = 18

Divide each side by '2'.
n = 9

Simplifying
n = 9

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