r^7/2-4r^5/2

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Solution for r^7/2-4r^5/2 equation: 


r in (-oo:+oo)

(r^7)/2-((4*r^5)/2) = 0

(r^7)/2-2*r^5 = 0

1/2*r^7-2*r^5 = 0

r^5*(1/2*r^2-2) = 0

1/2*r^2 = 2 // : 1/2

r^2 = 4

r^2 = 4 // ^ 1/2

abs(r) = 2

r = 2 or r = -2

r^5 = 0

1*r^5 = 0 // : 1

r^5 = 0

r = 0

r in { 2, -2, 0 }

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