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D( x )
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
x in (-oo:4/3) U (4/3:+oo)
(5*x-3)/(3*x-4) = y // - y
(5*x-3)/(3*x-4)-y = 0
(5*x-3)/(3*x-4)+(-y*(3*x-4))/(3*x-4) = 0
5*x-y*(3*x-4)-3 = 0
5*x-3*x*y+4*y-3 = 0
(5*x-3*x*y+4*y-3)/(3*x-4) = 0
(5*x-3*x*y+4*y-3)/(3*x-4) = 0 // * 3*x-4
5*x-3*x*y+4*y-3 = 0
4*y-3*x*y-3 = 0 // - 4*y-3
-3*x*y = -(4*y-3) // : -3*y
x = (-(4*y-3))/(-3*y)
x = (3-(4*y))/(-3*y)
x = (3-(4*y))/(-3*y)
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