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3+4d=15-5d-4d
We move all terms to the left:
3+4d-(15-5d-4d)=0
We add all the numbers together, and all the variables
4d-(-9d+15)+3=0
We get rid of parentheses
4d+9d-15+3=0
We add all the numbers together, and all the variables
13d-12=0
We move all terms containing d to the left, all other terms to the right
13d=12
d=12/13
d=12/13
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