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(5x+10)=3x-90
We move all terms to the left:
(5x+10)-(3x-90)=0
We get rid of parentheses
5x-3x+10+90=0
We add all the numbers together, and all the variables
2x+100=0
We move all terms containing x to the left, all other terms to the right
2x=-100
x=-100/2
x=-50
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