x=180-(180-x-30)-(180-3x-30)

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Solution for x=180-(180-x-30)-(180-3x-30) equation:


x=180-(180-x-30)-(180-3x-30)

We simplify the equation to the form, which is simple to understand 
x=180-(180-x-30)-(180-3x-30)

Simplifying terms in parentheses
x=180-(+150-1x)-(180-3x-30)

Simplifying terms in parentheses
x=180-(+150-1x)-(+150-3x)

Remove unnecessary parentheses
x=180-150+1x-(+150-3x)

Remove unnecessary parentheses
x=180-150+1x-150+3x

We move all terms containing x to the left and all other terms to the right. 
+1x-1x-3x=+180-150-150

We simplify left and right side of the equation. 
-3x=-120

We divide both sides of the equation by -3 to get x. 
x=40

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