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D( x )
5*x+10 = 0
2*x+4 = 0
5*x+10 = 0
5*x+10 = 0
5*x+10 = 0 // - 10
5*x = -10 // : 5
x = -10/5
x = -2
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x in (-oo:-2) U (-2:+oo)
2/(5*x+10)+3/(2*x+4) = 0
(2*(2*x+4))/((5*x+10)*(2*x+4))+(3*(5*x+10))/((5*x+10)*(2*x+4)) = 0
2*(2*x+4)+3*(5*x+10) = 0
19*x+38 = 0
(19*x+38)/((5*x+10)*(2*x+4)) = 0
(19*x+38)/((5*x+10)*(2*x+4)) = 0 // * (5*x+10)*(2*x+4)
19*x+38 = 0
19*x+38 = 0 // - 38
19*x = -38 // : 19
x = -38/19
x = -2
x in { -2}
x belongs to the empty set
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