21i-(4+9i)=

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Solution for 21i-(4+9i)= equation:


21i-(4+9i)=0

We simplify the equation to the form, which is simple to understand 
21i-(4+9i)=0

Remove unnecessary parentheses
21i-4-9i=0

We move all terms containing i to the left and all other terms to the right. 
+21i-9i=0+4

We simplify left and right side of the equation. 
+12i=+4

We divide both sides of the equation by 12 to get i. 
i=0.33333333333333

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