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6x+12=-3x-5
We move all terms to the left:
6x+12-(-3x-5)=0
We get rid of parentheses
6x+3x+5+12=0
We add all the numbers together, and all the variables
9x+17=0
We move all terms containing x to the left, all other terms to the right
9x=-17
x=-17/9
x=-1+8/9
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