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D( x )
3*x = 0
2*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
7/(2*x)-8 = 1/(3*x) // - 1/(3*x)
7/(2*x)-(1/(3*x))-8 = 0
7/(2*x)+(-1/3)*x^-1-8 = 0
19/6*x^-1 = 8 // : 19/6
x^-1 = 48/19
-1 < 0
1/(x^1) = 48/19 // * x^1
1 = 48/19*x^1 // : 48/19
19/48 = x^1
x = 19/48
x = 19/48
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