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10x-90=x-9
We move all terms to the left:
10x-90-(x-9)=0
We get rid of parentheses
10x-x+9-90=0
We add all the numbers together, and all the variables
9x-81=0
We move all terms containing x to the left, all other terms to the right
9x=81
x=81/9
x=9
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