7n+(90-n)=210

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Solution for 7n+(90-n)=210 equation:


Simplifying
7n + (90 + -1n) = 210

Remove parenthesis around (90 + -1n)
7n + 90 + -1n = 210

Reorder the terms:
90 + 7n + -1n = 210

Combine like terms: 7n + -1n = 6n
90 + 6n = 210

Solving
90 + 6n = 210

Solving for variable 'n'.

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

Add '-90' to each side of the equation.
90 + -90 + 6n = 210 + -90

Combine like terms: 90 + -90 = 0
0 + 6n = 210 + -90
6n = 210 + -90

Combine like terms: 210 + -90 = 120
6n = 120

Divide each side by '6'.
n = 20

Simplifying
n = 20

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