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d/2+7=18
We move all terms to the left:
d/2+7-(18)=0
We add all the numbers together, and all the variables
d/2-11=0
We multiply all the terms by the denominator
d-11*2=0
We add all the numbers together, and all the variables
d-22=0
We move all terms containing d to the left, all other terms to the right
d=22
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