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2x-12.5=3x+7.5
We move all terms to the left:
2x-12.5-(3x+7.5)=0
We get rid of parentheses
2x-3x-7.5-12.5=0
We add all the numbers together, and all the variables
-1x-20=0
We move all terms containing x to the left, all other terms to the right
-x=20
x=20/-1
x=-20
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