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r in (-oo:+oo)
((7^1)/2)*(((-r)^1)/6)*((2*r^3)/4) = 0
(7/2)*(-r/6)*((2*r^3)/4) = 0
-7/24*r^4 = 0 // : -7/24
r^4 = 0
r = 0
r = 0
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