21=3h+9

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Solution for 21=3h+9 equation: 



21=3h+9

We move all terms to the left:

21-(3h+9)=0

We get rid of parentheses

-3h-9+21=0

We add all the numbers together, and all the variables

-3h+12=0

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

-3h=-12

h=-12/-3

h=+4

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