h+2+h=21

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Solution for h+2+h=21 equation: 



h+2+h=21

We move all terms to the left:

h+2+h-(21)=0

We add all the numbers together, and all the variables

2h-19=0

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

2h=19

h=19/2

h=9+1/2

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