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120=4x+40-
We move all terms to the left:
120-(4x+40-)=0
We add all the numbers together, and all the variables
-(+4x)+120=0
We get rid of parentheses
-4x+120=0
We move all terms containing x to the left, all other terms to the right
-4x=-120
x=-120/-4
x=+30
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