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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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