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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
0.75 = x/(x+4) // - x/(x+4)
0.75-(x/(x+4)) = 0
(-1*x)/(x+4)+0.75 = 0
(-1*x)/(x+4)+(0.75*(x+4))/(x+4) = 0
0.75*(x+4)-1*x = 0
3-0.25*x = 0
(3-0.25*x)/(x+4) = 0
(3-0.25*x)/(x+4) = 0 // * x+4
3-0.25*x = 0
3-0.25*x = 0 // - 3
-0.25*x = -3 // : -0.25
x = -3/(-0.25)
x = 12
x = 12
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