90=4x-30

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Solution for 90=4x-30 equation: 


Simplifying
90 = 4x + -30

Reorder the terms:
90 = -30 + 4x

Solving
90 = -30 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
90 + -4x = -30 + 4x + -4x

Combine like terms: 4x + -4x = 0
90 + -4x = -30 + 0
90 + -4x = -30

Add '-90' to each side of the equation.
90 + -90 + -4x = -30 + -90

Combine like terms: 90 + -90 = 0
0 + -4x = -30 + -90
-4x = -30 + -90

Combine like terms: -30 + -90 = -120
-4x = -120

Divide each side by '-4'.
x = 30

Simplifying
x = 30

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