5/6=7/r

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Solution for 5/6=7/r equation: 


D( r )

r = 0

r = 0

r = 0

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

5/6 = 7/r // - 7/r

5/6-(7/r) = 0

5/6-7*r^-1 = 0

-7*r^-1 = -5/6 // : -7

r^-1 = 5/42

-1 < 0

1/(r^1) = 5/42 // * r^1

1 = 5/42*r^1 // : 5/42

42/5 = r^1

r = 42/5

r = 42/5

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