90-x=4(90-x)

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Solution for 90-x=4(90-x) equation:


Simplifying
90 + -1x = 4(90 + -1x)
90 + -1x = (90 * 4 + -1x * 4)
90 + -1x = (360 + -4x)

Solving
90 + -1x = 360 + -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 + -1x + 4x = 360 + -4x + 4x

Combine like terms: -1x + 4x = 3x
90 + 3x = 360 + -4x + 4x

Combine like terms: -4x + 4x = 0
90 + 3x = 360 + 0
90 + 3x = 360

Add '-90' to each side of the equation.
90 + -90 + 3x = 360 + -90

Combine like terms: 90 + -90 = 0
0 + 3x = 360 + -90
3x = 360 + -90

Combine like terms: 360 + -90 = 270
3x = 270

Divide each side by '3'.
x = 90

Simplifying
x = 90

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