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18x-90-2x-10=8x-20
We move all terms to the left:
18x-90-2x-10-(8x-20)=0
We add all the numbers together, and all the variables
16x-(8x-20)-100=0
We get rid of parentheses
16x-8x+20-100=0
We add all the numbers together, and all the variables
8x-80=0
We move all terms containing x to the left, all other terms to the right
8x=80
x=80/8
x=10
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