21=-5(8h-9)

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Solution for 21=-5(8h-9) equation: 



21=-5(8h-9)

We move all terms to the left:

21-(-5(8h-9))=0



We calculate terms in parentheses: -(-5(8h-9)), so:

-5(8h-9)

We multiply parentheses

-40h+45

Back to the equation:

-(-40h+45)



We get rid of parentheses

40h-45+21=0

We add all the numbers together, and all the variables

40h-24=0

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

40h=24

h=24/40

h=3/5

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