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D( x )
x-2 = 0
3*x+3 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
3*x+3 = 0
3*x+3 = 0
3*x+3 = 0 // - 3
3*x = -3 // : 3
x = -3/3
x = -1
x in (-oo:-1) U (-1:2) U (2:+oo)
12/(x-2) = 24/(3*x+3) // - 24/(3*x+3)
12/(x-2)-(24/(3*x+3)) = 0
12/(x-2)-24*(3*x+3)^-1 = 0
12/(x-2)-24/(3*x+3) = 0
(12*(3*x+3))/((x-2)*(3*x+3))+(-24*(x-2))/((x-2)*(3*x+3)) = 0
12*(3*x+3)-24*(x-2) = 0
12*x+84 = 0
(12*x+84)/((x-2)*(3*x+3)) = 0
(12*x+84)/((x-2)*(3*x+3)) = 0 // * (x-2)*(3*x+3)
12*x+84 = 0
12*x+84 = 0 // - 84
12*x = -84 // : 12
x = -84/12
x = -7
x = -7
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