x=2(15/(x-1))

Solution for x=2(15/(x-1)) equation:

D( x )

x-1 = 0

x-1 = 0

x-1 = 0

x-1 = 0 // + 1

x = 1

x in (-oo:1) U (1:+oo)

x = 2*(15/(x-1)) // - 2*(15/(x-1))

x-(2*(15/(x-1))) = 0

x-30*(x-1)^-1 = 0

x-30/(x-1) = 0

(x*(x-1))/(x-1)-30/(x-1) = 0

x*(x-1)-30 = 0

x^2-x-30 = 0

x^2-x-30 = 0

x^2-x-30 = 0

DELTA = (-1)^2-(-30*1*4)

DELTA = 121

DELTA > 0

x = (121^(1/2)+1)/(1*2) or x = (1-121^(1/2))/(1*2)

x = 6 or x = -5

(x+5)*(x-6) = 0

((x+5)*(x-6))/(x-1) = 0

((x+5)*(x-6))/(x-1) = 0 // * x-1

(x+5)*(x-6) = 0

( x+5 )

x+5 = 0 // - 5

x = -5

( x-6 )

x-6 = 0 // + 6

x = 6

x in { -5, 6 }