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v in (-oo:+oo)
28*v^7-(((12*v^3)/4)*v^3) = 0
28*v^7-3*v^6 = 0
28*v^7-3*v^6 = 0
v^6*(28*v-3) = 0
28*v-3 = 0 // + 3
28*v = 3 // : 28
v = 3/28
v^6 = 0
1*v^6 = 0 // : 1
v^6 = 0
v = 0
v in { 3/28, 0 }
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