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i in (-oo:+oo)
9-(((36*i)/9)*i) = 0
9-4*i^2 = 0
-4*i^2 = -9 // : -4
i^2 = 9/4
i^2 = 9/4 // ^ 1/2
abs(i) = 3/2
i = 3/2 or i = -3/2
i in { 3/2, -3/2 }
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