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3d+18=-4d-10
We move all terms to the left:
3d+18-(-4d-10)=0
We get rid of parentheses
3d+4d+10+18=0
We add all the numbers together, and all the variables
7d+28=0
We move all terms containing d to the left, all other terms to the right
7d=-28
d=-28/7
d=-4
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