12d+8-4d-5=21

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Solution for 12d+8-4d-5=21 equation: 



12d+8-4d-5=21

We move all terms to the left:

12d+8-4d-5-(21)=0

We add all the numbers together, and all the variables

8d-18=0

We move all terms containing d to the left, all other terms to the right

8d=18

d=18/8

d=2+1/4

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