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15-8x=12x+51
We move all terms to the left:
15-8x-(12x+51)=0
We get rid of parentheses
-8x-12x-51+15=0
We add all the numbers together, and all the variables
-20x-36=0
We move all terms containing x to the left, all other terms to the right
-20x=36
x=36/-20
x=-1+4/5
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