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D( x )
(6*x+2)*(7*x+5) = 0
(6*x+2)*(7*x+5) = 0
(6*x+2)*(7*x+5) = 0
( 6*x+2 )
6*x+2 = 0 // - 2
6*x = -2 // : 6
x = -2/6
x = -1/3
( 7*x+5 )
7*x+5 = 0 // - 5
7*x = -5 // : 7
x = -5/7
x in (-oo:-5/7) U (-5/7:-1/3) U (-1/3:+oo)
((7*x+6)*(2*x+10))/((6*x+2)*(7*x+5)) = 0
( 2*x+10 )
2*x+10 = 0 // - 10
2*x = -10 // : 2
x = -10/2
x = -5
( 7*x+6 )
7*x+6 = 0 // - 6
7*x = -6 // : 7
x = -6/7
x in { -5, -6/7 }
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