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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10*25-(35/x) = 300 // - 300
10*25-(35/x)-300 = 0
10*25-35*x^-1-300 = 0
-35*x^-1 = 50 // : -35
x^-1 = -10/7
-1 < 0
1/(x^1) = -10/7 // * x^1
1 = -10/7*x^1 // : -10/7
-7/10 = x^1
x = -7/10
x = -7/10
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