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(7+4x)=39
We move all terms to the left:
(7+4x)-(39)=0
We add all the numbers together, and all the variables
(4x+7)-39=0
We get rid of parentheses
4x+7-39=0
We add all the numbers together, and all the variables
4x-32=0
We move all terms containing x to the left, all other terms to the right
4x=32
x=32/4
x=8
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