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D( x )
10*x = 0
2*x = 0
10*x = 0
10*x = 0
10*x = 0 // : 10
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
1/3-(1/(2*x)) = 7/(10*x) // - 7/(10*x)
1/3-(1/(2*x))-(7/(10*x)) = 0
(-1/2)*x^-1+(-7/10)*x^-1+1/3 = 0
-6/5*x^-1 = -1/3 // : -6/5
x^-1 = 5/18
-1 < 0
1/(x^1) = 5/18 // * x^1
1 = 5/18*x^1 // : 5/18
18/5 = x^1
x = 18/5
x = 18/5
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