18d+3d-21d+4d=12

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Solution for 18d+3d-21d+4d=12 equation: 



18d+3d-21d+4d=12

We move all terms to the left:

18d+3d-21d+4d-(12)=0

We add all the numbers together, and all the variables

4d-12=0

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

4d=12

d=12/4

d=3

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