21=6-9h

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Solution for 21=6-9h equation: 



21=6-9h

We move all terms to the left:

21-(6-9h)=0

We add all the numbers together, and all the variables

-(-9h+6)+21=0

We get rid of parentheses

9h-6+21=0

We add all the numbers together, and all the variables

9h+15=0

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

9h=-15

h=-15/9

h=-1+2/3

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