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30=-3d-10
We move all terms to the left:
30-(-3d-10)=0
We get rid of parentheses
3d+10+30=0
We add all the numbers together, and all the variables
3d+40=0
We move all terms containing d to the left, all other terms to the right
3d=-40
d=-40/3
d=-13+1/3
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