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x=3x-78
We move all terms to the left:
x-(3x-78)=0
We get rid of parentheses
x-3x+78=0
We add all the numbers together, and all the variables
-2x+78=0
We move all terms containing x to the left, all other terms to the right
-2x=-78
x=-78/-2
x=+39
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