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D( x )
3-x = 0
x+1 = 0
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:3) U (3:+oo)
(x-12)/(3-x) = (x+16)/(x+1) // - (x+16)/(x+1)
(x-12)/(3-x)-((x+16)/(x+1)) = 0
(x-12)/(3-x)+(-1*(x+16))/(x+1) = 0
((x-12)*(x+1))/((3-x)*(x+1))+(-1*(x+16)*(3-x))/((3-x)*(x+1)) = 0
(x-12)*(x+1)-1*(x+16)*(3-x) = 0
2*x^2+2*x-60 = 0
2*x^2+2*x-60 = 0
2*(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 = (-121^(1/2)-1)/(1*2)
x = 5 or x = -6
2*(x+6)*(x-5) = 0
(2*(x+6)*(x-5))/((3-x)*(x+1)) = 0
(2*(x+6)*(x-5))/((3-x)*(x+1)) = 0 // * (3-x)*(x+1)
2*(x+6)*(x-5) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-5 )
x-5 = 0 // + 5
x = 5
x in { -6, 5 }
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