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180=x+30+x
We move all terms to the left:
180-(x+30+x)=0
We add all the numbers together, and all the variables
-(2x+30)+180=0
We get rid of parentheses
-2x-30+180=0
We add all the numbers together, and all the variables
-2x+150=0
We move all terms containing x to the left, all other terms to the right
-2x=-150
x=-150/-2
x=+75
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