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120=80+0.10x
We move all terms to the left:
120-(80+0.10x)=0
We add all the numbers together, and all the variables
-(0.10x+80)+120=0
We get rid of parentheses
-0.10x-80+120=0
We add all the numbers together, and all the variables
-0.1x+40=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-40
x=-40/-0.1
x=+400
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