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8(x-1)+6(x+2)=90
We move all terms to the left:
8(x-1)+6(x+2)-(90)=0
We multiply parentheses
8x+6x-8+12-90=0
We add all the numbers together, and all the variables
14x-86=0
We move all terms containing x to the left, all other terms to the right
14x=86
x=86/14
x=6+1/7
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