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v in (-oo:+oo)
28*v^6-(v^2*((36*v^5)/4)) = 0
28*v^6-9*v^7 = 0
28*v^6-9*v^7 = 0
v^6*(28-9*v) = 0
28-9*v = 0 // - 28
-9*v = -28 // : -9
v = -28/(-9)
v = 28/9
v^6 = 0
1*v^6 = 0 // : 1
v^6 = 0
v = 0
v in { 28/9, 0 }
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