8/5=7/r

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Solution for 8/5=7/r equation: 


D( r )

r = 0

r = 0

r = 0

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

8/5 = 7/r // - 7/r

8/5-(7/r) = 0

8/5-7*r^-1 = 0

-7*r^-1 = -8/5 // : -7

r^-1 = 8/35

-1 < 0

1/(r^1) = 8/35 // * r^1

1 = 8/35*r^1 // : 8/35

35/8 = r^1

r = 35/8

r = 35/8

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