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10x-81=x-36
We move all terms to the left:
10x-81-(x-36)=0
We get rid of parentheses
10x-x+36-81=0
We add all the numbers together, and all the variables
9x-45=0
We move all terms containing x to the left, all other terms to the right
9x=45
x=45/9
x=5
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