3(90-x)-(180-x)=10

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Solution for 3(90-x)-(180-x)=10 equation: 


Simplifying
3(90 + -1x) + -1(180 + -1x) = 10
(90 * 3 + -1x * 3) + -1(180 + -1x) = 10
(270 + -3x) + -1(180 + -1x) = 10
270 + -3x + (180 * -1 + -1x * -1) = 10
270 + -3x + (-180 + 1x) = 10

Reorder the terms:
270 + -180 + -3x + 1x = 10

Combine like terms: 270 + -180 = 90
90 + -3x + 1x = 10

Combine like terms: -3x + 1x = -2x
90 + -2x = 10

Solving
90 + -2x = 10

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 = 10 + -90

Combine like terms: 90 + -90 = 0
0 + -2x = 10 + -90
-2x = 10 + -90

Combine like terms: 10 + -90 = -80
-2x = -80

Divide each side by '-2'.
x = 40

Simplifying
x = 40

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