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d/2-13=-10
We move all terms to the left:
d/2-13-(-10)=0
We add all the numbers together, and all the variables
d/2-3=0
We multiply all the terms by the denominator
d-3*2=0
We add all the numbers together, and all the variables
d-6=0
We move all terms containing d to the left, all other terms to the right
d=6
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