30=I-(-9)

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Solution for 30=I-(-9) equation:


30=i-(-9)

We simplify the equation to the form, which is simple to understand 
30=i-(-9)

Remove unnecessary parentheses
30=i+9

We move all terms containing i to the left and all other terms to the right. 
-1i=+9-30

We simplify left and right side of the equation. 
-1i=-21

We divide both sides of the equation by -01 to get i. 
i=21

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