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78x-39=12x+92
We move all terms to the left:
78x-39-(12x+92)=0
We get rid of parentheses
78x-12x-92-39=0
We add all the numbers together, and all the variables
66x-131=0
We move all terms containing x to the left, all other terms to the right
66x=131
x=131/66
x=1+65/66
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