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4=40x-120
We move all terms to the left:
4-(40x-120)=0
We get rid of parentheses
-40x+120+4=0
We add all the numbers together, and all the variables
-40x+124=0
We move all terms containing x to the left, all other terms to the right
-40x=-124
x=-124/-40
x=3+1/10
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