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3x-91=15x-17
We move all terms to the left:
3x-91-(15x-17)=0
We get rid of parentheses
3x-15x+17-91=0
We add all the numbers together, and all the variables
-12x-74=0
We move all terms containing x to the left, all other terms to the right
-12x=74
x=74/-12
x=-6+1/6
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