7h+21=21-2h

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Solution for 7h+21=21-2h equation: 



7h+21=21-2h

We move all terms to the left:

7h+21-(21-2h)=0

We add all the numbers together, and all the variables

7h-(-2h+21)+21=0

We get rid of parentheses

7h+2h-21+21=0

We add all the numbers together, and all the variables

9h=0

h=0/9

h=0

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