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D( x )
x-7 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x in (-oo:7) U (7:+oo)
(x-1)/(x-7) = 2/5 // - 2/5
(x-1)/(x-7)-(2/5) = 0
(x-1)/(x-7)-2/5 = 0
(5*(x-1))/(5*(x-7))+(-2*(x-7))/(5*(x-7)) = 0
5*(x-1)-2*(x-7) = 0
3*x+9 = 0
(3*x+9)/(5*(x-7)) = 0
(3*x+9)/(5*(x-7)) = 0 // * 5*(x-7)
3*x+9 = 0
3*x+9 = 0 // - 9
3*x = -9 // : 3
x = -9/3
x = -3
x = -3
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