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8x+6=-3x-9
We move all terms to the left:
8x+6-(-3x-9)=0
We get rid of parentheses
8x+3x+9+6=0
We add all the numbers together, and all the variables
11x+15=0
We move all terms containing x to the left, all other terms to the right
11x=-15
x=-15/11
x=-1+4/11
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