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9x+10=5x-90
We move all terms to the left:
9x+10-(5x-90)=0
We get rid of parentheses
9x-5x+90+10=0
We add all the numbers together, and all the variables
4x+100=0
We move all terms containing x to the left, all other terms to the right
4x=-100
x=-100/4
x=-25
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