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v in (-oo:+oo)
18*v^6-(v^2*((4*v^5)/2)) = 0
18*v^6-2*v^7 = 0
18*v^6-2*v^7 = 0
2*v^6*(9-v) = 0
9-v = 0 // - 9
-v = -9 // * -1
v = 9
2*v^6 = 0
2*v^6 = 0 // : 2
v^6 = 0
v = 0
v in { 9, 0 }
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