56/r-8=0

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Solution for 56/r-8=0 equation: 


D( r )

r = 0

r = 0

r = 0

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

56/r-8 = 0

56*r^-1 = 8 // : 56

r^-1 = 1/7

-1 < 0

1/(r^1) = 1/7 // * r^1

1 = 1/7*r^1 // : 1/7

7 = r^1

r = 7

r = 7

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