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4x=7x+39
We move all terms to the left:
4x-(7x+39)=0
We get rid of parentheses
4x-7x-39=0
We add all the numbers together, and all the variables
-3x-39=0
We move all terms containing x to the left, all other terms to the right
-3x=39
x=39/-3
x=-13
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