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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2485/x = 49*r^35 // - 49*r^35
2485/x-(49*r^35) = 0
2485/x-49*r^35 = 0
2485*x^-1 = -(-49*r^35) // : 2485
x^-1 = (7*r^35)/355
-1 < 0
1/(x^1) = (7*r^35)/355 // * x^1
1 = ((7*r^35)/355)*x^1 // : (7*r^35)/355
(355*r^-35)/7 = x^1
x = (355*r^-35)/7
x = (355*r^-35)/7
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