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180=80+3x+x
We move all terms to the left:
180-(80+3x+x)=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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