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D( x )
5*x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
v/(5*x) = w/y // - w/y
v/(5*x)-(w/y) = 0
1/5*v*x^-1 = w*y^-1 // : 1/5*v
x^-1 = 5*v^-1*w*y^-1
-1 < 0
1/(x^1) = 5*v^-1*w*y^-1 // * x^1
1 = 5*v^-1*w*x^1*y^-1 // : 5*v^-1*w*y^-1
1/(5*v^-1*w*y^-1) = x^1
x = 1/(5*v^-1*w*y^-1)
x = 1/(5*v^-1*w*y^-1)
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