(x+1+x+1)/(x+1)

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Solution for (x+1+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)

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

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