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d/4+-15=-13
We move all terms to the left:
d/4+-15-(-13)=0
We add all the numbers together, and all the variables
d/4-2=0
We multiply all the terms by the denominator
d-2*4=0
We add all the numbers together, and all the variables
d-8=0
We move all terms containing d to the left, all other terms to the right
d=8
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