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15x+3=-2x-15
We move all terms to the left:
15x+3-(-2x-15)=0
We get rid of parentheses
15x+2x+15+3=0
We add all the numbers together, and all the variables
17x+18=0
We move all terms containing x to the left, all other terms to the right
17x=-18
x=-18/17
x=-1+1/17
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