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120+.40x=80+.60x
We move all terms to the left:
120+.40x-(80+.60x)=0
We add all the numbers together, and all the variables
.40x-(.60x+80)+120=0
We get rid of parentheses
.40x-.60x-80+120=0
We add all the numbers together, and all the variables
-0.2x+40=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-40
x=-40/-0.2
x=+200
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