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