5=10/r

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Solution for 5=10/r equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

5 = 10/r // - 10/r

5-(10/r) = 0

5-10*r^-1 = 0

-10*r^-1 = -5 // : -10

r^-1 = 1/2

-1 < 0

1/(r^1) = 1/2 // * r^1

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

2 = r^1

r = 2

r = 2

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