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7+78x=39x+35
We move all terms to the left:
7+78x-(39x+35)=0
We get rid of parentheses
78x-39x-35+7=0
We add all the numbers together, and all the variables
39x-28=0
We move all terms containing x to the left, all other terms to the right
39x=28
x=28/39
x=28/39
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