12-3h=-30

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Solution for 12-3h=-30 equation: 



12-3h=-30

We move all terms to the left:

12-3h-(-30)=0

We add all the numbers together, and all the variables

-3h+42=0

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

-3h=-42

h=-42/-3

h=+14

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