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i in (-oo:+oo)
(6*i*(-(1*i)-2))/4+4*i = 0
(6*i*(-i-2))/4+4*i = 0
(6*i*(-i-2))/4+(4*4*i)/4 = 0
6*i*(-i-2)+4*4*i = 0
4*i-6*i^2 = 0
4*i-6*i^2 = 0
2*i*(2-3*i) = 0
2-3*i = 0 // - 2
-3*i = -2 // : -3
i = -2/(-3)
i = 2/3
2*i*(i-2/3) = 0
(2*i*(i-2/3))/4 = 0
(2*i*(i-2/3))/4 = 0 // * 4
2*i*(i-2/3) = 0
( 2*i )
2*i = 0 // : 2
i = 0
( i-2/3 )
i-2/3 = 0 // + 2/3
i = 2/3
i in { 0, 2/3 }
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