4/r=5/7

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Solution for 4/r=5/7 equation: 


D( r )

r = 0

r = 0

r = 0

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

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

4/r-(5/7) = 0

4/r-5/7 = 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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