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6x+18=-3x-9
We move all terms to the left:
6x+18-(-3x-9)=0
We get rid of parentheses
6x+3x+9+18=0
We add all the numbers together, and all the variables
9x+27=0
We move all terms containing x to the left, all other terms to the right
9x=-27
x=-27/9
x=-3
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