21=122-i

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Solution for 21=122-i equation: 



21=122-i

We move all terms to the left:

21-(122-i)=0

We add all the numbers together, and all the variables

-(-1i+122)+21=0

We get rid of parentheses

1i-122+21=0

We add all the numbers together, and all the variables

i-101=0

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

i=101

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