20=12+-h

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Solution for 20=12+-h equation: 



20=12+-h

We move all terms to the left:

20-(12+-h)=0

We add all the numbers together, and all the variables

-(-1h)+20=0

We get rid of parentheses

1h+20=0

We add all the numbers together, and all the variables

h+20=0

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

h=-20

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