90=7x-1+3x-9

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Solution for 90=7x-1+3x-9 equation:


Simplifying
90 = 7x + -1 + 3x + -9

Reorder the terms:
90 = -1 + -9 + 7x + 3x

Combine like terms: -1 + -9 = -10
90 = -10 + 7x + 3x

Combine like terms: 7x + 3x = 10x
90 = -10 + 10x

Solving
90 = -10 + 10x

Solving for variable 'x'.

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

Add '-10x' to each side of the equation.
90 + -10x = -10 + 10x + -10x

Combine like terms: 10x + -10x = 0
90 + -10x = -10 + 0
90 + -10x = -10

Add '-90' to each side of the equation.
90 + -90 + -10x = -10 + -90

Combine like terms: 90 + -90 = 0
0 + -10x = -10 + -90
-10x = -10 + -90

Combine like terms: -10 + -90 = -100
-10x = -100

Divide each side by '-10'.
x = 10

Simplifying
x = 10

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