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180=101+x+51
We move all terms to the left:
180-(101+x+51)=0
We add all the numbers together, and all the variables
-(x+152)+180=0
We get rid of parentheses
-x-152+180=0
We add all the numbers together, and all the variables
-1x+28=0
We move all terms containing x to the left, all other terms to the right
-x=-28
x=-28/-1
x=+28
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