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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = 4/x-(7/8) // - 4/x-(7/8)
7/8-(4/x)+2 = 0
7/8-4*x^-1+2 = 0
-4*x^-1 = -23/8 // : -4
x^-1 = 23/32
-1 < 0
1/(x^1) = 23/32 // * x^1
1 = 23/32*x^1 // : 23/32
32/23 = x^1
x = 32/23
x = 32/23
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