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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7.5/x-(8/x)-7.5+1 = 0
7.5/x-8*x^-1-7.5+1 = 0
-0.5*x^-1 = 6.5 // : -0.5
x^-1 = -13
-1 < 0
1/(x^1) = -13 // * x^1
1 = -13*x^1 // : -13
-1/13 = x^1
x = -1/13
x = -1/13
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