7x/(7x-18)(x+9)

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Solution for 7x/(7x-18)(x+9) equation: 


D( x )

7*x-18 = 0

7*x-18 = 0

7*x-18 = 0

7*x-18 = 0 // + 18

7*x = 18 // : 7

x = 18/7

x in (-oo:18/7) U (18/7:+oo)

((7*x)/(7*x-18))*(x+9) = 0

(7*x*(x+9))/(7*x-18) = 0

( 7*x )

7*x = 0 // : 7

x = 0

( x+9 )

x+9 = 0 // - 9

x = -9

x in { 0, -9 }

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