12=3.d

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Solution for 12=3.d equation: 



12=3.d

We move all terms to the left:

12-(3.d)=0

We add all the numbers together, and all the variables

-(+3.d)+12=0

We get rid of parentheses

-3.d+12=0

We add all the numbers together, and all the variables

-3d+12=0

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

-3d=-12

d=-12/-3

d=+4

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