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d/2+5=15
We move all terms to the left:
d/2+5-(15)=0
We add all the numbers together, and all the variables
d/2-10=0
We multiply all the terms by the denominator
d-10*2=0
We add all the numbers together, and all the variables
d-20=0
We move all terms containing d to the left, all other terms to the right
d=20
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