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66=x+7x-6
We move all terms to the left:
66-(x+7x-6)=0
We add all the numbers together, and all the variables
-(8x-6)+66=0
We get rid of parentheses
-8x+6+66=0
We add all the numbers together, and all the variables
-8x+72=0
We move all terms containing x to the left, all other terms to the right
-8x=-72
x=-72/-8
x=+9
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