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(8x-10)+(3x+90)=90
We move all terms to the left:
(8x-10)+(3x+90)-(90)=0
We get rid of parentheses
8x+3x-10+90-90=0
We add all the numbers together, and all the variables
11x-10=0
We move all terms containing x to the left, all other terms to the right
11x=10
x=10/11
x=10/11
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