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8x+1=12x+91
We move all terms to the left:
8x+1-(12x+91)=0
We get rid of parentheses
8x-12x-91+1=0
We add all the numbers together, and all the variables
-4x-90=0
We move all terms containing x to the left, all other terms to the right
-4x=90
x=90/-4
x=-22+1/2
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