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4x+78=13x-39
We move all terms to the left:
4x+78-(13x-39)=0
We get rid of parentheses
4x-13x+39+78=0
We add all the numbers together, and all the variables
-9x+117=0
We move all terms containing x to the left, all other terms to the right
-9x=-117
x=-117/-9
x=+13
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