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4x-78=4x-2x
We move all terms to the left:
4x-78-(4x-2x)=0
We add all the numbers together, and all the variables
4x-(+2x)-78=0
We get rid of parentheses
4x-2x-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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