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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
2/(x+5)+7/4 = 2 // - 2
2/(x+5)+7/4-2 = 0
(2*4)/(4*(x+5))+(7*(x+5))/(4*(x+5))+(-2*4*(x+5))/(4*(x+5)) = 0
7*(x+5)-2*4*(x+5)+2*4 = 0
7*x-8*x-40+43 = 0
3-x = 0
(3-x)/(4*(x+5)) = 0
(3-x)/(4*(x+5)) = 0 // * 4*(x+5)
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x = 3
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