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180=105+105+140+135+125+135+x
We move all terms to the left:
180-(105+105+140+135+125+135+x)=0
We add all the numbers together, and all the variables
-(x+745)+180=0
We get rid of parentheses
-x-745+180=0
We add all the numbers together, and all the variables
-1x-565=0
We move all terms containing x to the left, all other terms to the right
-x=565
x=565/-1
x=-565
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