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d/2+10=4
We move all terms to the left:
d/2+10-(4)=0
We add all the numbers together, and all the variables
d/2+6=0
We multiply all the terms by the denominator
d+6*2=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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