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2x+3.5=4x-12.5
We move all terms to the left:
2x+3.5-(4x-12.5)=0
We get rid of parentheses
2x-4x+12.5+3.5=0
We add all the numbers together, and all the variables
-2x+16=0
We move all terms containing x to the left, all other terms to the right
-2x=-16
x=-16/-2
x=+8
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