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13+7d=5d-4d-11
We move all terms to the left:
13+7d-(5d-4d-11)=0
We add all the numbers together, and all the variables
7d-(d-11)+13=0
We get rid of parentheses
7d-d+11+13=0
We add all the numbers together, and all the variables
6d+24=0
We move all terms containing d to the left, all other terms to the right
6d=-24
d=-24/6
d=-4
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