5/7=4/r

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Solution for 5/7=4/r equation: 


D( r )

r = 0

r = 0

r = 0

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

5/7 = 4/r // - 4/r

5/7-(4/r) = 0

5/7-4*r^-1 = 0

-4*r^-1 = -5/7 // : -4

r^-1 = 5/28

-1 < 0

1/(r^1) = 5/28 // * r^1

1 = 5/28*r^1 // : 5/28

28/5 = r^1

r = 28/5

r = 28/5

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