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x+2(x=7)=3x-7
We move all terms to the left:
x+2(x-(7))=0
We multiply parentheses
x+2x-14=0
We add all the numbers together, and all the variables
3x-14=0
We move all terms containing x to the left, all other terms to the right
3x=14
x=14/3
x=4+2/3
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