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(2x-2)+(8x-9)=90
We move all terms to the left:
(2x-2)+(8x-9)-(90)=0
We get rid of parentheses
2x+8x-2-9-90=0
We add all the numbers together, and all the variables
10x-101=0
We move all terms containing x to the left, all other terms to the right
10x=101
x=101/10
x=10+1/10
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