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7x-4=4x+39
We move all terms to the left:
7x-4-(4x+39)=0
We get rid of parentheses
7x-4x-39-4=0
We add all the numbers together, and all the variables
3x-43=0
We move all terms containing x to the left, all other terms to the right
3x=43
x=43/3
x=14+1/3
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