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15=x+2.5
We move all terms to the left:
15-(x+2.5)=0
We get rid of parentheses
-x-2.5+15=0
We add all the numbers together, and all the variables
-1x+12.5=0
We move all terms containing x to the left, all other terms to the right
-x=-12.5
x=-12.5/-1
x=12+0.5/1
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