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u in (-oo:+oo)
12*u^7-(((10*u^3)/2)*u^3) = 0
12*u^7-5*u^6 = 0
12*u^7-5*u^6 = 0
u^6*(12*u-5) = 0
12*u-5 = 0 // + 5
12*u = 5 // : 12
u = 5/12
u^6 = 0
1*u^6 = 0 // : 1
u^6 = 0
u = 0
u in { 5/12, 0 }
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