(x+9)/(2x+14)*(8x+56)/(9x+81)

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Solution for (x+9)/(2x+14)*(8x+56)/(9x+81) equation: 


D( x )

9*x+81 = 0

2*x+14 = 0

9*x+81 = 0

9*x+81 = 0

9*x+81 = 0 // - 81

9*x = -81 // : 9

x = -81/9

x = -9

2*x+14 = 0

2*x+14 = 0

2*x+14 = 0 // - 14

2*x = -14 // : 2

x = -14/2

x = -7

x in (-oo:-9) U (-9:-7) U (-7:+oo)

(((x+9)/(2*x+14))*(8*x+56))/(9*x+81) = 0

((x+9)*(8*x+56))/((2*x+14)*(9*x+81)) = 0

( 8*x+56 )

8*x+56 = 0 // - 56

8*x = -56 // : 8

x = -56/8

x = -7

( x+9 )

x+9 = 0 // - 9

x = -9

x in { -7} 

x in { -9} 

x belongs to the empty set

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