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13-d=3(-3-3)
We move all terms to the left:
13-d-(3(-3-3))=0
We add all the numbers together, and all the variables
-d+13-(3(-6))=0
We add all the numbers together, and all the variables
-1d+31=0
We move all terms containing d to the left, all other terms to the right
-d=-31
d=-31/-1
d=+31
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