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12.5-6x=-2x-3.5
We move all terms to the left:
12.5-6x-(-2x-3.5)=0
We get rid of parentheses
-6x+2x+3.5+12.5=0
We add all the numbers together, and all the variables
-4x+16=0
We move all terms containing x to the left, all other terms to the right
-4x=-16
x=-16/-4
x=+4
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