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-30+4d=-6d
We move all terms to the left:
-30+4d-(-6d)=0
We get rid of parentheses
4d+6d-30=0
We add all the numbers together, and all the variables
10d-30=0
We move all terms containing d to the left, all other terms to the right
10d=30
d=30/10
d=3
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