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15=-2x-3-x
We move all terms to the left:
15-(-2x-3-x)=0
We add all the numbers together, and all the variables
-(-3x-3)+15=0
We get rid of parentheses
3x+3+15=0
We add all the numbers together, and all the variables
3x+18=0
We move all terms containing x to the left, all other terms to the right
3x=-18
x=-18/3
x=-6
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