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D( x )
12*x+60 = 0
2*x^2-2 = 0
12*x+60 = 0
12*x+60 = 0
12*x+60 = 0 // - 60
12*x = -60 // : 12
x = -60/12
x = -5
2*x^2-2 = 0
2*x^2-2 = 0
2*x^2 = 2 // : 2
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in (-oo:-5) U (-5:-1) U (-1:1) U (1:+oo)
(((6*x+6)/(12*x+60))*(3*x+15))/(2*x^2-2) = 0
((6*x+6)*(3*x+15))/((12*x+60)*(2*x^2-2)) = 0
( 3*x+15 )
3*x+15 = 0 // - 15
3*x = -15 // : 3
x = -15/3
x = -5
( 6*x+6 )
6*x+6 = 0 // - 6
6*x = -6 // : 6
x = -6/6
x = -1
x in { -5}
x in { -1}
x belongs to the empty set
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