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180-(3x-20)=x
We move all terms to the left:
180-(3x-20)-(x)=0
We add all the numbers together, and all the variables
-1x-(3x-20)+180=0
We get rid of parentheses
-1x-3x+20+180=0
We add all the numbers together, and all the variables
-4x+200=0
We move all terms containing x to the left, all other terms to the right
-4x=-200
x=-200/-4
x=+50
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