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8x+12=6x+9x
We move all terms to the left:
8x+12-(6x+9x)=0
We add all the numbers together, and all the variables
8x-(+15x)+12=0
We get rid of parentheses
8x-15x+12=0
We add all the numbers together, and all the variables
-7x+12=0
We move all terms containing x to the left, all other terms to the right
-7x=-12
x=-12/-7
x=1+5/7
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