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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x+1 = 7/12 // - 7/12
1/x+1/x-(7/12)+1 = 0
1/x+1/x-7/12+1 = 0
2*x^-1 = -5/12 // : 2
x^-1 = -5/24
-1 < 0
1/(x^1) = -5/24 // * x^1
1 = -5/24*x^1 // : -5/24
-24/5 = x^1
x = -24/5
x = -24/5
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