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-30=5d-5
We move all terms to the left:
-30-(5d-5)=0
We get rid of parentheses
-5d+5-30=0
We add all the numbers together, and all the variables
-5d-25=0
We move all terms containing d to the left, all other terms to the right
-5d=25
d=25/-5
d=-5
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