21=11-i

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Solution for 21=11-i equation: 



21=11-i

We move all terms to the left:

21-(11-i)=0

We add all the numbers together, and all the variables

-(-1i+11)+21=0

We get rid of parentheses

1i-11+21=0

We add all the numbers together, and all the variables

i+10=0

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

i=-10

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