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3+2x+6x-12=9x-13
We move all terms to the left:
3+2x+6x-12-(9x-13)=0
We add all the numbers together, and all the variables
8x-(9x-13)-9=0
We get rid of parentheses
8x-9x+13-9=0
We add all the numbers together, and all the variables
-1x+4=0
We move all terms containing x to the left, all other terms to the right
-x=-4
x=-4/-1
x=+4
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