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4x-20+x+12+x+1=90
We move all terms to the left:
4x-20+x+12+x+1-(90)=0
We add all the numbers together, and all the variables
6x-97=0
We move all terms containing x to the left, all other terms to the right
6x=97
x=97/6
x=16+1/6
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