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

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


D( x )

9*x-7 = 0

9*x-7 = 0

9*x-7 = 0

9*x-7 = 0 // + 7

9*x = 7 // : 9

x = 7/9

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

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

(7*x+9)/(9*x-7)-9*x*(9*x-7)^-1 = 0

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

7*x-9*x+9 = 0

9-2*x = 0

(9-2*x)/(9*x-7) = 0

(9-2*x)/(9*x-7) = 0 // * 9*x-7

9-2*x = 0

9-2*x = 0 // - 9

-2*x = -9 // : -2

x = -9/(-2)

x = 9/2

x = 9/2

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