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d/4+-21=-15
We move all terms to the left:
d/4+-21-(-15)=0
We add all the numbers together, and all the variables
d/4-6=0
We multiply all the terms by the denominator
d-6*4=0
We add all the numbers together, and all the variables
d-24=0
We move all terms containing d to the left, all other terms to the right
d=24
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