9i=4i-20

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Solution for 9i=4i-20 equation: 



9i=4i-20

We move all terms to the left:

9i-(4i-20)=0

We get rid of parentheses

9i-4i+20=0

We add all the numbers together, and all the variables

5i+20=0

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

5i=-20

i=-20/5

i=-4

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