3d-d+2d+3d+d=12

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Solution for 3d-d+2d+3d+d=12 equation: 



3d-d+2d+3d+d=12

We move all terms to the left:

3d-d+2d+3d+d-(12)=0

We add all the numbers together, and all the variables

8d-12=0

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

8d=12

d=12/8

d=1+1/2

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