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D( x )
5*x+10 = 0
5*x+10 = 0
5*x+10 = 0
5*x+10 = 0 // - 10
5*x = -10 // : 5
x = -10/5
x = -2
x in (-oo:-2) U (-2:+oo)
((2*x)/5)*((6*x+12)/(5*x+10)) = 0
(2/5*x*(6*x+12))/(5*x+10) = 0
( 2/5*x )
2/5*x = 0 // : 2/5
x = 0
( 6*x+12 )
6*x+12 = 0 // - 12
6*x = -12 // : 6
x = -12/6
x = -2
x in { -2}
x = 0
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