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D( x )
x-56 = 0
x-56 = 0
x-56 = 0
x-56 = 0 // + 56
x = 56
x in (-oo:56) U (56:+oo)
y-7 = 3/(x-56) // - 3/(x-56)
y-(3/(x-56))-7 = 0
y-3*(x-56)^-1-7 = 0
y-3/(x-56)-7 = 0
(y*(x-56))/(x-56)-3/(x-56)+(-7*(x-56))/(x-56) = 0
y*(x-56)-7*(x-56)-3 = 0
x*y-7*x-56*y-3+392 = 0
x*y-7*x-56*y+389 = 0
(x*y-7*x-56*y+389)/(x-56) = 0
(x*y-7*x-56*y+389)/(x-56) = 0 // * x-56
x*y-7*x-56*y+389 = 0
389-7*x-56*y = 0 // - 389-56*y
-7*x = -(389-56*y) // : -7
x = (-(389-56*y))/(-7)
x = (389-56*y)/7
x = (389-56*y)/7
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