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7-9x-15+12x=3x-8
We move all terms to the left:
7-9x-15+12x-(3x-8)=0
We add all the numbers together, and all the variables
3x-(3x-8)-8=0
We get rid of parentheses
3x-3x+8-8=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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