7h+21=-399

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Solution for 7h+21=-399 equation: 



7h+21=-399

We move all terms to the left:

7h+21-(-399)=0

We add all the numbers together, and all the variables

7h+420=0

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

7h=-420

h=-420/7

h=-60

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