90-3x=4x+13

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Solution for 90-3x=4x+13 equation:


Simplifying
90 + -3x = 4x + 13

Reorder the terms:
90 + -3x = 13 + 4x

Solving
90 + -3x = 13 + 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 + -3x + -4x = 13 + 4x + -4x

Combine like terms: -3x + -4x = -7x
90 + -7x = 13 + 4x + -4x

Combine like terms: 4x + -4x = 0
90 + -7x = 13 + 0
90 + -7x = 13

Add '-90' to each side of the equation.
90 + -90 + -7x = 13 + -90

Combine like terms: 90 + -90 = 0
0 + -7x = 13 + -90
-7x = 13 + -90

Combine like terms: 13 + -90 = -77
-7x = -77

Divide each side by '-7'.
x = 11

Simplifying
x = 11

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