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3d/5-20=4
We move all terms to the left:
3d/5-20-(4)=0
We add all the numbers together, and all the variables
3d/5-24=0
We multiply all the terms by the denominator
3d-24*5=0
We add all the numbers together, and all the variables
3d-120=0
We move all terms containing d to the left, all other terms to the right
3d=120
d=120/3
d=40
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