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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)
2-(30/(x-1))-x = 0
2-30*(x-1)^-1-x = 0
2-30/(x-1)-x = 0
(-x*(x-1))/(x-1)-30/(x-1)+(2*(x-1))/(x-1) = 0
2*(x-1)-x*(x-1)-30 = 0
x-x^2+2*x-30-2 = 0
3*x-x^2-32 = 0
3*x-x^2-32 = 0
3*x-x^2-32 = 0
DELTA = 3^2-(-32*(-1)*4)
DELTA = -119
DELTA < 0
1 = 0
1/(x-1) = 0
1/(x-1) = 0 // * x-1
1 = 0
x belongs to the empty set
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