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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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