90=n-9+n

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Solution for 90=n-9+n equation:


Simplifying
90 = n + -9 + n

Reorder the terms:
90 = -9 + n + n

Combine like terms: n + n = 2n
90 = -9 + 2n

Solving
90 = -9 + 2n

Solving for variable 'n'.

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

Add '-2n' to each side of the equation.
90 + -2n = -9 + 2n + -2n

Combine like terms: 2n + -2n = 0
90 + -2n = -9 + 0
90 + -2n = -9

Add '-90' to each side of the equation.
90 + -90 + -2n = -9 + -90

Combine like terms: 90 + -90 = 0
0 + -2n = -9 + -90
-2n = -9 + -90

Combine like terms: -9 + -90 = -99
-2n = -99

Divide each side by '-2'.
n = 49.5

Simplifying
n = 49.5

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