21=7+2h

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Solution for 21=7+2h equation: 



21=7+2h

We move all terms to the left:

21-(7+2h)=0

We add all the numbers together, and all the variables

-(2h+7)+21=0

We get rid of parentheses

-2h-7+21=0

We add all the numbers together, and all the variables

-2h+14=0

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

-2h=-14

h=-14/-2

h=+7

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