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7x=3x-27
We move all terms to the left:
7x-(3x-27)=0
We get rid of parentheses
7x-3x+27=0
We add all the numbers together, and all the variables
4x+27=0
We move all terms containing x to the left, all other terms to the right
4x=-27
x=-27/4
x=-6+3/4
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