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-9i-9i=0
We simplify the equation to the form, which is simple to understand
-9i-9i=0
We move all terms containing i to the left and all other terms to the right.
-9i-9i=0
We simplify left and right side of the equation.
-18i=0
We divide both sides of the equation by -18 to get i.
i=-0
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