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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)
(2*x+7)/(x-3)-1 = 0
(2*x+7)/(x-3)+(-1*(x-3))/(x-3) = 0
2*x-1*(x-3)+7 = 0
x+10 = 0
(x+10)/(x-3) = 0
(x+10)/(x-3) = 0 // * x-3
x+10 = 0
x+10 = 0 // - 10
x = -10
x = -10
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