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