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180=65+40+x
We move all terms to the left:
180-(65+40+x)=0
We add all the numbers together, and all the variables
-(x+105)+180=0
We get rid of parentheses
-x-105+180=0
We add all the numbers together, and all the variables
-1x+75=0
We move all terms containing x to the left, all other terms to the right
-x=-75
x=-75/-1
x=+75
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