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x in (-oo:+oo)
(12*i)/15 = i*(x/4) // - i*(x/4)
(12*i)/15-(i*(x/4)) = 0
4/5*i-1/4*i*x = 0 // - 4/5*i
-1/4*i*x = -(4/5*i) // : -1/4*i
x = (-(4/5*i))/(-1/4*i)
x = 16/5
x = 16/5
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