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135=2.5x+80
We move all terms to the left:
135-(2.5x+80)=0
We get rid of parentheses
-2.5x-80+135=0
We add all the numbers together, and all the variables
-2.5x+55=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-55
x=-55/-2.5
x=+22
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