49/r=7

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Solution for 49/r=7 equation: 


D( r )

r = 0

r = 0

r = 0

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

49/r = 7 // - 7

49/r-7 = 0

49*r^-1 = 7 // : 49

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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