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3(d+6)=-18
We move all terms to the left:
3(d+6)-(-18)=0
We add all the numbers together, and all the variables
3(d+6)+18=0
We multiply parentheses
3d+18+18=0
We add all the numbers together, and all the variables
3d+36=0
We move all terms containing d to the left, all other terms to the right
3d=-36
d=-36/3
d=-12
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