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D( x )
5*x+1 = 0
5*x+1 = 0
5*x+1 = 0
5*x+1 = 0 // - 1
5*x = -1 // : 5
x = -1/5
x in (-oo:-1/5) U (-1/5:+oo)
(3*x-5)/(5*x+1) = y // - y
(3*x-5)/(5*x+1)-y = 0
(3*x-5)/(5*x+1)+(-y*(5*x+1))/(5*x+1) = 0
3*x-y*(5*x+1)-5 = 0
3*x-5*x*y-y-5 = 0
(3*x-5*x*y-y-5)/(5*x+1) = 0
(3*x-5*x*y-y-5)/(5*x+1) = 0 // * 5*x+1
3*x-5*x*y-y-5 = 0
-5*x*y-y-5 = 0 // + -y-5
-5*x*y = -(-y-5) // : -5*y
x = (-(-y-5))/(-5*y)
x = (y+5)/(-5*y)
x = (y+5)/(-5*y)
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