x-20=3(90-x)

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Solution for x-20=3(90-x) equation:


Simplifying
x + -20 = 3(90 + -1x)

Reorder the terms:
-20 + x = 3(90 + -1x)
-20 + x = (90 * 3 + -1x * 3)
-20 + x = (270 + -3x)

Solving
-20 + x = 270 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-20 + x + 3x = 270 + -3x + 3x

Combine like terms: x + 3x = 4x
-20 + 4x = 270 + -3x + 3x

Combine like terms: -3x + 3x = 0
-20 + 4x = 270 + 0
-20 + 4x = 270

Add '20' to each side of the equation.
-20 + 20 + 4x = 270 + 20

Combine like terms: -20 + 20 = 0
0 + 4x = 270 + 20
4x = 270 + 20

Combine like terms: 270 + 20 = 290
4x = 290

Divide each side by '4'.
x = 72.5

Simplifying
x = 72.5

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