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D( x )
4*x+16 = 0
4*x = 0
4*x+16 = 0
4*x+16 = 0
4*x+16 = 0 // - 16
4*x = -16 // : 4
x = -16/4
x = -4
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:-4) U (-4:0) U (0:+oo)
1/(4*x+16)-1/(4*x) = 1/4 // - 1/4
1/(4*x+16)-1/(4*x)-(1/4) = 0
1/(4*x+16)-1/(4*x)-1/4 = 0
(1*4*4*x)/(4*4*x*(4*x+16))+(-1*4*(4*x+16))/(4*4*x*(4*x+16))+(-1*4*x*(4*x+16))/(4*4*x*(4*x+16)) = 0
1*4*4*x-1*4*(4*x+16)-1*4*x*(4*x+16) = 0
-16*x^2-64*x-64 = 0
-16*x^2-64*x-64 = 0
-16*(x^2+4*x+4) = 0
x^2+4*x+4 = 0
DELTA = 4^2-(1*4*4)
DELTA = 0
x = -4/(1*2)
x = -2 or x = -2
-16*(x+2)^2 = 0
(-16*(x+2)^2)/(4*4*x*(4*x+16)) = 0
(-16*(x+2)^2)/(4*4*x*(4*x+16)) = 0 // * 4*4*x*(4*x+16)
-16*(x+2)^2 = 0
x+2 = 0 // - 2
x = -2
x in { -2, -2 }
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