81=4h+9

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Solution for 81=4h+9 equation: 



81=4h+9

We move all terms to the left:

81-(4h+9)=0

We get rid of parentheses

-4h-9+81=0

We add all the numbers together, and all the variables

-4h+72=0

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

-4h=-72

h=-72/-4

h=+18

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