8/7=10/r

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Solution for 8/7=10/r equation: 


D( r )

r = 0

r = 0

r = 0

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

8/7 = 10/r // - 10/r

8/7-(10/r) = 0

8/7-10*r^-1 = 0

-10*r^-1 = -8/7 // : -10

r^-1 = 4/35

-1 < 0

1/(r^1) = 4/35 // * r^1

1 = 4/35*r^1 // : 4/35

35/4 = r^1

r = 35/4

r = 35/4

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