-3h-9=12

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Solution for -3h-9=12 equation: 



-3h-9=12

We move all terms to the left:

-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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