12d+9=57

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Solution for 12d+9=57 equation: 



12d+9=57

We move all terms to the left:

12d+9-(57)=0

We add all the numbers together, and all the variables

12d-48=0

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

12d=48

d=48/12

d=4

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