9h+21=7h

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Solution for 9h+21=7h equation: 



9h+21=7h

We move all terms to the left:

9h+21-(7h)=0

We add all the numbers together, and all the variables

2h+21=0

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

2h=-21

h=-21/2

h=-10+1/2

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