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d/4-4=-13
We move all terms to the left:
d/4-4-(-13)=0
We add all the numbers together, and all the variables
d/4+9=0
We multiply all the terms by the denominator
d+9*4=0
We add all the numbers together, and all the variables
d+36=0
We move all terms containing d to the left, all other terms to the right
d=-36
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