(9x/(x+1))-((7x-2)/(x+1))

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Solution for (9x/(x+1))-((7x-2)/(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)

(9*x)/(x+1)-((7*x-2)/(x+1)) = 0

(9*x)/(x+1)+(-1*(7*x-2))/(x+1) = 0

9*x-1*(7*x-2) = 0

2*x+2 = 0

(2*x+2)/(x+1) = 0

(2*x+2)/(x+1) = 0 // * x+1

2*x+2 = 0

2*x+2 = 0 // - 2

2*x = -2 // : 2

x = -2/2

x = -1

x in { -1} 

x belongs to the empty set

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