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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
300/(3*x) = 275 // - 275
300/(3*x)-275 = 0
100*x^-1 = 275 // : 100
x^-1 = 11/4
-1 < 0
1/(x^1) = 11/4 // * x^1
1 = 11/4*x^1 // : 11/4
4/11 = x^1
x = 4/11
x = 4/11
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