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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
4/(x-2) = x/12 // - x/12
4/(x-2)-(x/12) = 0
4/(x-2)-x/12 = 0
(4*12)/(12*(x-2))+(-x*(x-2))/(12*(x-2)) = 0
4*12-x*(x-2) = 0
2*x-x^2+48 = 0
2*x-x^2+48 = 0
2*x-x^2+48 = 0
DELTA = 2^2-(-1*4*48)
DELTA = 196
DELTA > 0
x = (196^(1/2)-2)/(-1*2) or x = (-196^(1/2)-2)/(-1*2)
x = -6 or x = 8
(x+6)*(x-8) = 0
((x+6)*(x-8))/(12*(x-2)) = 0
((x+6)*(x-8))/(12*(x-2)) = 0 // * 12*(x-2)
(x+6)*(x-8) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-8 )
x-8 = 0 // + 8
x = 8
x in { -6, 8 }
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