(7/(x+1)(x-1))+(8/(x+1)(x-1))

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Solution for (7/(x+1)(x-1))+(8/(x+1)(x-1)) equation: 


D( x )

x+1 = 0

x+1 = 0

x+1 = 0

x+1 = 0 // - 1

x = -1

x in (-oo:-1) U (-1:+oo)

(7/(x+1))*(x-1)+(8/(x+1))*(x-1) = 0

(7*(x-1))/(x+1)+(8*(x-1))/(x+1) = 0

7*(x-1)+8*(x-1) = 0

15*x-15 = 0

(15*x-15)/(x+1) = 0

(15*x-15)/(x+1) = 0 // * x+1

15*x-15 = 0

15*x-15 = 0 // + 15

15*x = 15 // : 15

x = 15/15

x = 1

x = 1

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