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8x-23+6x-1+2x+1=90
We move all terms to the left:
8x-23+6x-1+2x+1-(90)=0
We add all the numbers together, and all the variables
16x-113=0
We move all terms containing x to the left, all other terms to the right
16x=113
x=113/16
x=7+1/16
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