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13+8d=-20-5d-15
We move all terms to the left:
13+8d-(-20-5d-15)=0
We add all the numbers together, and all the variables
8d-(-5d-35)+13=0
We get rid of parentheses
8d+5d+35+13=0
We add all the numbers together, and all the variables
13d+48=0
We move all terms containing d to the left, all other terms to the right
13d=-48
d=-48/13
d=-3+9/13
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