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15d+74=28d-30
We move all terms to the left:
15d+74-(28d-30)=0
We get rid of parentheses
15d-28d+30+74=0
We add all the numbers together, and all the variables
-13d+104=0
We move all terms containing d to the left, all other terms to the right
-13d=-104
d=-104/-13
d=+8
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