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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