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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x+2 = 1/7 // - 1/7
1/x+1/x-(1/7)+2 = 0
1/x+1/x-1/7+2 = 0
2*x^-1 = -13/7 // : 2
x^-1 = -13/14
-1 < 0
1/(x^1) = -13/14 // * x^1
1 = -13/14*x^1 // : -13/14
-14/13 = x^1
x = -14/13
x = -14/13
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