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10x-66=78+x
We move all terms to the left:
10x-66-(78+x)=0
We add all the numbers together, and all the variables
10x-(x+78)-66=0
We get rid of parentheses
10x-x-78-66=0
We add all the numbers together, and all the variables
9x-144=0
We move all terms containing x to the left, all other terms to the right
9x=144
x=144/9
x=16
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