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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x+2 = 9/40 // - 9/40
1/x+1/x-(9/40)+2 = 0
1/x+1/x-9/40+2 = 0
2*x^-1 = -71/40 // : 2
x^-1 = -71/80
-1 < 0
1/(x^1) = -71/80 // * x^1
1 = -71/80*x^1 // : -71/80
-80/71 = x^1
x = -80/71
x = -80/71
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