10/7=4/r

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Solution for 10/7=4/r equation: 


D( r )

r = 0

r = 0

r = 0

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

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

10/7-(4/r) = 0

10/7-4*r^-1 = 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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