90=20-7x

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Solution for 90=20-7x equation:


Simplifying
90 = 20 + -7x

Solving
90 = 20 + -7x

Solving for variable 'x'.

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

Add '7x' to each side of the equation.
90 + 7x = 20 + -7x + 7x

Combine like terms: -7x + 7x = 0
90 + 7x = 20 + 0
90 + 7x = 20

Add '-90' to each side of the equation.
90 + -90 + 7x = 20 + -90

Combine like terms: 90 + -90 = 0
0 + 7x = 20 + -90
7x = 20 + -90

Combine like terms: 20 + -90 = -70
7x = -70

Divide each side by '7'.
x = -10

Simplifying
x = -10

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