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