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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
2-x = -(30/(x-1)) // + 30/(x-1)
30/(x-1)-x+2 = 0
30/(x-1)+(-x*(x-1))/(x-1)+(2*(x-1))/(x-1) = 0
2*(x-1)-x*(x-1)+30 = 0
x-x^2+2*x-2+30 = 0
3*x-x^2+28 = 0
3*x-x^2+28 = 0
3*x-x^2+28 = 0
DELTA = 3^2-(-1*4*28)
DELTA = 121
DELTA > 0
x = (121^(1/2)-3)/(-1*2) or x = (-121^(1/2)-3)/(-1*2)
x = -4 or x = 7
(x+4)*(x-7) = 0
((x+4)*(x-7))/(x-1) = 0
((x+4)*(x-7))/(x-1) = 0 // * x-1
(x+4)*(x-7) = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x-7 )
x-7 = 0 // + 7
x = 7
x in { -4, 7 }
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