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-10+-2=-3x-9
We move all terms to the left:
-10+-2-(-3x-9)=0
We add all the numbers together, and all the variables
-(-3x-9)=0
We get rid of parentheses
3x+9=0
We move all terms containing x to the left, all other terms to the right
3x=-9
x=-9/3
x=-3
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