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-3x-6x=-1-12+15
We move all terms to the left:
-3x-6x-(-1-12+15)=0
We add all the numbers together, and all the variables
-3x-6x-2=0
We add all the numbers together, and all the variables
-9x-2=0
We move all terms containing x to the left, all other terms to the right
-9x=2
x=2/-9
x=-2/9
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