(7r-63)/(2r-18)

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Solution for (7r-63)/(2r-18) equation: 


D( r )

2*r-18 = 0

2*r-18 = 0

2*r-18 = 0

2*r-18 = 0 // + 18

2*r = 18 // : 2

r = 18/2

r = 9

r in (-oo:9) U (9:+oo)

(7*r-63)/(2*r-18) = 0

7*r-63 = 0 // + 63

7*r = 63 // : 7

r = 63/7

r = 9

r in { 9} 

r belongs to the empty set

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