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15.5=x-12.5
We move all terms to the left:
15.5-(x-12.5)=0
We get rid of parentheses
-x+12.5+15.5=0
We add all the numbers together, and all the variables
-1x+28=0
We move all terms containing x to the left, all other terms to the right
-x=-28
x=-28/-1
x=+28
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