3(90-x)-(180-x)=20

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Solution for 3(90-x)-(180-x)=20 equation:


Simplifying
3(90 + -1x) + -1(180 + -1x) = 20
(90 * 3 + -1x * 3) + -1(180 + -1x) = 20
(270 + -3x) + -1(180 + -1x) = 20
270 + -3x + (180 * -1 + -1x * -1) = 20
270 + -3x + (-180 + 1x) = 20

Reorder the terms:
270 + -180 + -3x + 1x = 20

Combine like terms: 270 + -180 = 90
90 + -3x + 1x = 20

Combine like terms: -3x + 1x = -2x
90 + -2x = 20

Solving
90 + -2x = 20

Solving for variable 'x'.

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

Add '-90' to each side of the equation.
90 + -90 + -2x = 20 + -90

Combine like terms: 90 + -90 = 0
0 + -2x = 20 + -90
-2x = 20 + -90

Combine like terms: 20 + -90 = -70
-2x = -70

Divide each side by '-2'.
x = 35

Simplifying
x = 35

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