12d+d-13d+3d=18

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Solution for 12d+d-13d+3d=18 equation: 



12d+d-13d+3d=18

We move all terms to the left:

12d+d-13d+3d-(18)=0

We add all the numbers together, and all the variables

3d-18=0

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

3d=18

d=18/3

d=6

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