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D( x )
x+5 = 0
4*x-3 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
4*x-3 = 0
4*x-3 = 0
4*x-3 = 0 // + 3
4*x = 3 // : 4
x = 3/4
x in (-oo:-5) U (-5:3/4) U (3/4:+oo)
7/(4*x-3) = 2/(x+5) // - 2/(x+5)
7/(4*x-3)-(2/(x+5)) = 0
7/(4*x-3)-2*(x+5)^-1 = 0
7/(4*x-3)-2/(x+5) = 0
(7*(x+5))/((4*x-3)*(x+5))+(-2*(4*x-3))/((4*x-3)*(x+5)) = 0
7*(x+5)-2*(4*x-3) = 0
41-x = 0
(41-x)/((4*x-3)*(x+5)) = 0
(41-x)/((4*x-3)*(x+5)) = 0 // * (4*x-3)*(x+5)
41-x = 0
41-x = 0 // - 41
-x = -41 // * -1
x = 41
x = 41
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