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180-x=3x+20
We move all terms to the left:
180-x-(3x+20)=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+160=0
We move all terms containing x to the left, all other terms to the right
-4x=-160
x=-160/-4
x=+40
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