90=(n)+(n+90-n)

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

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

Reorder the terms:
90 = n + (90 + n + -1n)

Combine like terms: n + -1n = 0
90 = n + (90 + 0)
90 = n + (90)
90 = n + 90

Reorder the terms:
90 = 90 + n

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

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

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

Solving
0 = n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
0 + -1n = n + -1n
Remove the zero:
-1n = n + -1n

Combine like terms: n + -1n = 0
-1n = 0

Divide each side by '-1'.
n = 0

Simplifying
n = 0