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d/2=6.5
We move all terms to the left:
d/2-(6.5)=0
We add all the numbers together, and all the variables
d/2-6.5=0
We multiply all the terms by the denominator
d-(6.5)*2=0
We add all the numbers together, and all the variables
d-13=0
We move all terms containing d to the left, all other terms to the right
d=13
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