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d/3-9=-10
We move all terms to the left:
d/3-9-(-10)=0
We add all the numbers together, and all the variables
d/3+1=0
We multiply all the terms by the denominator
d+1*3=0
We add all the numbers together, and all the variables
d+3=0
We move all terms containing d to the left, all other terms to the right
d=-3
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