7=21/r

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Solution for 7=21/r equation: 


D( r )

r = 0

r = 0

r = 0

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

7 = 21/r // - 21/r

7-(21/r) = 0

7-21*r^-1 = 0

-21*r^-1 = -7 // : -21

r^-1 = 1/3

-1 < 0

1/(r^1) = 1/3 // * r^1

1 = 1/3*r^1 // : 1/3

3 = r^1

r = 3

r = 3

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