12=3h-9

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Solution for 12=3h-9 equation: 



12=3h-9

We move all terms to the left:

12-(3h-9)=0

We get rid of parentheses

-3h+9+12=0

We add all the numbers together, and all the variables

-3h+21=0

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

-3h=-21

h=-21/-3

h=+7

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