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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
100/(4*x) = 180 // - 180
100/(4*x)-180 = 0
25*x^-1 = 180 // : 25
x^-1 = 36/5
-1 < 0
1/(x^1) = 36/5 // * x^1
1 = 36/5*x^1 // : 36/5
5/36 = x^1
x = 5/36
x = 5/36
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