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D( x )
3*x = 0
x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
150/(3*x)+50/x = 200/5 // - 200/5
150/(3*x)+50/x-(200/5) = 0
150/(3*x)+50/x-40 = 0
100*x^-1 = 40 // : 100
x^-1 = 2/5
-1 < 0
1/(x^1) = 2/5 // * x^1
1 = 2/5*x^1 // : 2/5
5/2 = x^1
x = 5/2
x = 5/2
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