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9x-1=10x-66
We move all terms to the left:
9x-1-(10x-66)=0
We get rid of parentheses
9x-10x+66-1=0
We add all the numbers together, and all the variables
-1x+65=0
We move all terms containing x to the left, all other terms to the right
-x=-65
x=-65/-1
x=+65
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