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D( x )
0.33*x-65 = 0
0.33*x-65 = 0
0.33*x-65 = 0
0.33*x-65 = 0 // + 65
0.33*x = 65 // : 0.33
x = 65/0.33
x = 196.96969697
x in (-oo:196.96969697) U (196.96969697:+oo)
(1*y-65)/(0.33*x-65) = 16 // - 16
(1*y-65)/(0.33*x-65)-16 = 0
(y-65)/(0.33*x-65)-16 = 0
(y-65)/(0.33*x-65)+(-16*(0.33*x-65))/(0.33*x-65) = 0
y-16*(0.33*x-65)-65 = 0
y-5.28*x+975 = 0
(y-5.28*x+975)/(0.33*x-65) = 0
(y-5.28*x+975)/(0.33*x-65) = 0 // * 0.33*x-65
y-5.28*x+975 = 0
y-5.28*x+975 = 0 // - y+975
-5.28*x = -(y+975) // : -5.28
x = (-(y+975))/(-5.28)
x = 0.18939394*(y+975)
x = 0.18939394*(y+975)
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