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D( x )
2*x+43 = 0
2*x+43 = 0
2*x+43 = 0
2*x+43 = 0 // - 43
2*x = -43 // : 2
x = -43/2
x in (-oo:-43/2) U (-43/2:+oo)
(x+13)/(2*x+43) = 0
x+13 = 0 // - 13
x = -13
x = -13
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