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4d-10=-3d-20
We move all terms to the left:
4d-10-(-3d-20)=0
We get rid of parentheses
4d+3d+20-10=0
We add all the numbers together, and all the variables
7d+10=0
We move all terms containing d to the left, all other terms to the right
7d=-10
d=-10/7
d=-1+3/7
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