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6x+12=-9x-8
We move all terms to the left:
6x+12-(-9x-8)=0
We get rid of parentheses
6x+9x+8+12=0
We add all the numbers together, and all the variables
15x+20=0
We move all terms containing x to the left, all other terms to the right
15x=-20
x=-20/15
x=-1+1/3
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