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D( x )
x+2 = 0
x = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = 0
x = 0
x in (-oo:-2) U (-2:0) U (0:+oo)
3/x-(3/(x+2)) = 2 // - 2
3/x-(3/(x+2))-2 = 0
3/x-3*(x+2)^-1-2 = 0
3/x-3/(x+2)-2 = 0
(-3*x)/(x*(x+2))+(3*(x+2))/(x*(x+2))+(-2*x*(x+2))/(x*(x+2)) = 0
3*(x+2)-2*x*(x+2)-3*x = 0
6-2*x^2-4*x = 0
6-2*x^2-4*x = 0
2*(3-x^2-2*x) = 0
3-x^2-2*x = 0
DELTA = (-2)^2-(-1*3*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+2)/(-1*2) or x = (2-16^(1/2))/(-1*2)
x = -3 or x = 1
2*(x+3)*(x-1) = 0
(2*(x+3)*(x-1))/(x*(x+2)) = 0
(2*(x+3)*(x-1))/(x*(x+2)) = 0 // * x*(x+2)
2*(x+3)*(x-1) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -3, 1 }
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