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115=2.5x+85
We move all terms to the left:
115-(2.5x+85)=0
We get rid of parentheses
-2.5x-85+115=0
We add all the numbers together, and all the variables
-2.5x+30=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-30
x=-30/-2.5
x=+12
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