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54/(-9)=d
We move all terms to the left:
54/(-9)-(d)=0
We add all the numbers together, and all the variables
-1d+54/(-9)=0
We multiply all the terms by the denominator
-1d*(-9)+54=0
We multiply parentheses
9d+54=0
We move all terms containing d to the left, all other terms to the right
9d=-54
d=-54/9
d=-6
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