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d/4+12=15
We move all terms to the left:
d/4+12-(15)=0
We add all the numbers together, and all the variables
d/4-3=0
We multiply all the terms by the denominator
d-3*4=0
We add all the numbers together, and all the variables
d-12=0
We move all terms containing d to the left, all other terms to the right
d=12
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