12=d+7

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Solution for 12=d+7 equation: 



12=d+7

We move all terms to the left:

12-(d+7)=0

We get rid of parentheses

-d-7+12=0

We add all the numbers together, and all the variables

-1d+5=0

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

-d=-5

d=-5/-1

d=+5

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