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58=4d-30
We move all terms to the left:
58-(4d-30)=0
We get rid of parentheses
-4d+30+58=0
We add all the numbers together, and all the variables
-4d+88=0
We move all terms containing d to the left, all other terms to the right
-4d=-88
d=-88/-4
d=+22
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