7/4=9/r

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Solution for 7/4=9/r equation: 


D( r )

r = 0

r = 0

r = 0

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

7/4 = 9/r // - 9/r

7/4-(9/r) = 0

7/4-9*r^-1 = 0

-9*r^-1 = -7/4 // : -9

r^-1 = 7/36

-1 < 0

1/(r^1) = 7/36 // * r^1

1 = 7/36*r^1 // : 7/36

36/7 = r^1

r = 36/7

r = 36/7

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