12+9h=30

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Solution for 12+9h=30 equation: 



12+9h=30

We move all terms to the left:

12+9h-(30)=0

We add all the numbers together, and all the variables

9h-18=0

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

9h=18

h=18/9

h=2

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