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2.5x-3=-3.5x-12
We move all terms to the left:
2.5x-3-(-3.5x-12)=0
We get rid of parentheses
2.5x+3.5x+12-3=0
We add all the numbers together, and all the variables
6x+9=0
We move all terms containing x to the left, all other terms to the right
6x=-9
x=-9/6
x=-1+1/2
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