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7x+6=66+x
We move all terms to the left:
7x+6-(66+x)=0
We add all the numbers together, and all the variables
7x-(x+66)+6=0
We get rid of parentheses
7x-x-66+6=0
We add all the numbers together, and all the variables
6x-60=0
We move all terms containing x to the left, all other terms to the right
6x=60
x=60/6
x=10
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