20=i-9

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Solution for 20=i-9 equation: 



20=i-9

We move all terms to the left:

20-(i-9)=0

We get rid of parentheses

-i+9+20=0

We add all the numbers together, and all the variables

-1i+29=0

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

-i=-29

i=-29/-1

i=+29

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