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15(d/3-6)=115
We move all terms to the left:
15(d/3-6)-(115)=0
We multiply parentheses
15d-90-115=0
We add all the numbers together, and all the variables
15d-205=0
We move all terms containing d to the left, all other terms to the right
15d=205
d=205/15
d=13+2/3
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