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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