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2x=8x-78
We move all terms to the left:
2x-(8x-78)=0
We get rid of parentheses
2x-8x+78=0
We add all the numbers together, and all the variables
-6x+78=0
We move all terms containing x to the left, all other terms to the right
-6x=-78
x=-78/-6
x=+13
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