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u in (-oo:+oo)
12*u^7-(((14*u^3)/2)*u^3) = 0
12*u^7-7*u^6 = 0
12*u^7-7*u^6 = 0
u^6*(12*u-7) = 0
12*u-7 = 0 // + 7
12*u = 7 // : 12
u = 7/12
u^6 = 0
1*u^6 = 0 // : 1
u^6 = 0
u = 0
u in { 7/12, 0 }
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