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