4/r=10/7

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Solution for 4/r=10/7 equation: 


D( r )

r = 0

r = 0

r = 0

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

4/r = 10/7 // - 10/7

4/r-(10/7) = 0

4/r-10/7 = 0

4*r^-1 = 10/7 // : 4

r^-1 = 5/14

-1 < 0

1/(r^1) = 5/14 // * r^1

1 = 5/14*r^1 // : 5/14

14/5 = r^1

r = 14/5

r = 14/5

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