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5x-78=2x+78
We move all terms to the left:
5x-78-(2x+78)=0
We get rid of parentheses
5x-2x-78-78=0
We add all the numbers together, and all the variables
3x-156=0
We move all terms containing x to the left, all other terms to the right
3x=156
x=156/3
x=52
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