7/r=4

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Solution for 7/r=4 equation: 


D( r )

r = 0

r = 0

r = 0

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

7/r = 4 // - 4

7/r-4 = 0

7*r^-1 = 4 // : 7

r^-1 = 4/7

-1 < 0

1/(r^1) = 4/7 // * r^1

1 = 4/7*r^1 // : 4/7

7/4 = r^1

r = 7/4

r = 7/4

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