21+h=18-h

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Solution for 21+h=18-h equation: 



21+h=18-h

We move all terms to the left:

21+h-(18-h)=0

We add all the numbers together, and all the variables

h-(-1h+18)+21=0

We get rid of parentheses

h+1h-18+21=0

We add all the numbers together, and all the variables

2h+3=0

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

2h=-3

h=-3/2

h=-1+1/2

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