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D( x )
x^2+2*x+1 = 0
3*x-15 = 0
6*x-30 = 0
x^2+2*x+1 = 0
x^2+2*x+1 = 0
x^2+2*x+1 = 0
DELTA = 2^2-(1*1*4)
DELTA = 0
x = -2/(1*2)
x = -1 or x = -1
3*x-15 = 0
3*x-15 = 0
3*x-15 = 0 // + 15
3*x = 15 // : 3
x = 15/3
x = 5
6*x-30 = 0
6*x-30 = 0
6*x-30 = 0 // + 30
6*x = 30 // : 6
x = 30/6
x = 5
x in (-oo:-1) U (-1:5) U (5:+oo)
(((x^2)/(3*x-15))/(x^2+2*x+1))/(6*x-30) = 0
(x^2)/((3*x-15)*(x^2+2*x+1)*(6*x-30)) = 0
x^2+2*x+1 = 0
x^2+2*x+1 = 0
DELTA = 2^2-(1*1*4)
DELTA = 0
x = -2/(1*2)
x = -1 or x = -1
(x+1)^2 = 0
(x^2)/((3*x-15)*(x+1)^2*(6*x-30)) = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x = 0
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