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6(d+30)=8
We move all terms to the left:
6(d+30)-(8)=0
We multiply parentheses
6d+180-8=0
We add all the numbers together, and all the variables
6d+172=0
We move all terms containing d to the left, all other terms to the right
6d=-172
d=-172/6
d=-28+2/3
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