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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
252 = (y+7)/(x-3) // - (y+7)/(x-3)
252-((y+7)/(x-3)) = 0
(-1*(y+7))/(x-3)+252 = 0
(-1*(y+7))/(x-3)+(252*(x-3))/(x-3) = 0
252*(x-3)-1*(y+7) = 0
252*x-y-763 = 0
(252*x-y-763)/(x-3) = 0
(252*x-y-763)/(x-3) = 0 // * x-3
252*x-y-763 = 0
252*x-y-763 = 0 // + -y-763
252*x = -(-y-763) // : 252
x = (-(-y-763))/252
x = (y+763)/252
x = (y+763)/252
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