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12.5+3.5x=1.5x-0.5
We move all terms to the left:
12.5+3.5x-(1.5x-0.5)=0
We get rid of parentheses
3.5x-1.5x+0.5+12.5=0
We add all the numbers together, and all the variables
2x+13=0
We move all terms containing x to the left, all other terms to the right
2x=-13
x=-13/2
x=-6+1/2
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