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10x-90=6x-81
We move all terms to the left:
10x-90-(6x-81)=0
We get rid of parentheses
10x-6x+81-90=0
We add all the numbers together, and all the variables
4x-9=0
We move all terms containing x to the left, all other terms to the right
4x=9
x=9/4
x=2+1/4
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