4h+9=21

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Solution for 4h+9=21 equation: 



4h+9=21

We move all terms to the left:

4h+9-(21)=0

We add all the numbers together, and all the variables

4h-12=0

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

4h=12

h=12/4

h=3

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