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3x+18=39+-4x
We move all terms to the left:
3x+18-(39+-4x)=0
We add all the numbers together, and all the variables
3x-(-4x)+18=0
We get rid of parentheses
3x+4x+18=0
We add all the numbers together, and all the variables
7x+18=0
We move all terms containing x to the left, all other terms to the right
7x=-18
x=-18/7
x=-2+4/7
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