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D( v )
(v-2.5)*(v+2.5) = 0
(v-2.5)*(v+2.5) = 0
(v-2.5)*(v+2.5) = 0
( v+2.5 )
v+2.5 = 0 // - 2.5
v = -2.5
( v-2.5 )
v-2.5 = 0 // + 2.5
v = 2.5
v in (-oo:-2.5) U (-2.5:2.5) U (2.5:+oo)
(29*v+19*v-72.5+47.5)/((v-2.5)*(v+2.5)) = 4 // - 4
(29*v+19*v-72.5+47.5)/((v-2.5)*(v+2.5))-4 = 0
(48*v-25)/((v-2.5)*(v+2.5))-4 = 0
(48*v-25)/((v-2.5)*(v+2.5))+(-4*(v-2.5)*(v+2.5))/((v-2.5)*(v+2.5)) = 0
48*v-4*(v-2.5)*(v+2.5)-25 = 0
48*v-4*v^2 = 0
48*v-4*v^2 = 0
4*v*(12-v) = 0
12-v = 0 // - 12
-v = -12 // * -1
v = 12
4*v*(v-12) = 0
(4*v*(v-12))/((v-2.5)*(v+2.5)) = 0
(4*v*(v-12))/((v-2.5)*(v+2.5)) = 0 // * (v-2.5)*(v+2.5)
4*v*(v-12) = 0
( 4*v )
4*v = 0 // : 4
v = 0
( v-12 )
v-12 = 0 // + 12
v = 12
v in { 0, 12 }
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