21=h+18

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Solution for 21=h+18 equation: 



21=h+18

We move all terms to the left:

21-(h+18)=0

We get rid of parentheses

-h-18+21=0

We add all the numbers together, and all the variables

-1h+3=0

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

-h=-3

h=-3/-1

h=+3

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