2h+21=8h-9

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Solution for 2h+21=8h-9 equation: 



2h+21=8h-9

We move all terms to the left:

2h+21-(8h-9)=0

We get rid of parentheses

2h-8h+9+21=0

We add all the numbers together, and all the variables

-6h+30=0

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

-6h=-30

h=-30/-6

h=+5

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