6=4/r-7

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Solution for 6=4/r-7 equation: 


D( r )

r = 0

r = 0

r = 0

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

6 = 4/r-7 // - 4/r-7

6-(4/r)+7 = 0

6-4*r^-1+7 = 0

-4*r^-1 = -13 // : -4

r^-1 = 13/4

-1 < 0

1/(r^1) = 13/4 // * r^1

1 = 13/4*r^1 // : 13/4

4/13 = r^1

r = 4/13

r = 4/13

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