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9x+15=-3x-18
We move all terms to the left:
9x+15-(-3x-18)=0
We get rid of parentheses
9x+3x+18+15=0
We add all the numbers together, and all the variables
12x+33=0
We move all terms containing x to the left, all other terms to the right
12x=-33
x=-33/12
x=-2+3/4
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