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180=80-4x
We move all terms to the left:
180-(80-4x)=0
We add all the numbers together, and all the variables
-(-4x+80)+180=0
We get rid of parentheses
4x-80+180=0
We add all the numbers together, and all the variables
4x+100=0
We move all terms containing x to the left, all other terms to the right
4x=-100
x=-100/4
x=-25
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