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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)
1/(4*x)+25 = 50 // - 50
1/(4*x)-50+25 = 0
1/4*x^-1 = 25 // : 1/4
x^-1 = 100
-1 < 0
1/(x^1) = 100 // * x^1
1 = 100*x^1 // : 100
1/100 = x^1
x = 1/100
x = 1/100
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