8d-7d+d=12

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Solution for 8d-7d+d=12 equation: 



8d-7d+d=12

We move all terms to the left:

8d-7d+d-(12)=0

We add all the numbers together, and all the variables

2d-12=0

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

2d=12

d=12/2

d=6

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