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7+d/2=3
We move all terms to the left:
7+d/2-(3)=0
We add all the numbers together, and all the variables
d/2+4=0
We multiply all the terms by the denominator
d+4*2=0
We add all the numbers together, and all the variables
d+8=0
We move all terms containing d to the left, all other terms to the right
d=-8
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