90=10n-3+9n-2

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Solution for 90=10n-3+9n-2 equation:


Simplifying
90 = 10n + -3 + 9n + -2

Reorder the terms:
90 = -3 + -2 + 10n + 9n

Combine like terms: -3 + -2 = -5
90 = -5 + 10n + 9n

Combine like terms: 10n + 9n = 19n
90 = -5 + 19n

Solving
90 = -5 + 19n

Solving for variable 'n'.

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

Add '-19n' to each side of the equation.
90 + -19n = -5 + 19n + -19n

Combine like terms: 19n + -19n = 0
90 + -19n = -5 + 0
90 + -19n = -5

Add '-90' to each side of the equation.
90 + -90 + -19n = -5 + -90

Combine like terms: 90 + -90 = 0
0 + -19n = -5 + -90
-19n = -5 + -90

Combine like terms: -5 + -90 = -95
-19n = -95

Divide each side by '-19'.
n = 5

Simplifying
n = 5

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