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7x+12-9x=20-17x+15x-8
We move all terms to the left:
7x+12-9x-(20-17x+15x-8)=0
We add all the numbers together, and all the variables
7x-9x-(-2x+12)+12=0
We add all the numbers together, and all the variables
-2x-(-2x+12)+12=0
We get rid of parentheses
-2x+2x-12+12=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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