(6r+12)/(3r-9)

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Solution for (6r+12)/(3r-9) equation: 


D( r )

3*r-9 = 0

3*r-9 = 0

3*r-9 = 0

3*r-9 = 0 // + 9

3*r = 9 // : 3

r = 9/3

r = 3

r in (-oo:3) U (3:+oo)

(6*r+12)/(3*r-9) = 0

6*r+12 = 0 // - 12

6*r = -12 // : 6

r = -12/6

r = -2

r = -2

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