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D( x )
x+4 = 0
4*x-3 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
4*x-3 = 0
4*x-3 = 0
4*x-3 = 0 // + 3
4*x = 3 // : 4
x = 3/4
x in (-oo:-4) U (-4:3/4) U (3/4:+oo)
(2*x)/(x+4) = (-3*x)/(4*x-3) // - (-3*x)/(4*x-3)
(2*x)/(x+4)-((-3*x)/(4*x-3)) = 0
(2*x)/(x+4)+3*x*(4*x-3)^-1 = 0
(2*x)/(x+4)+(3*x)/(4*x-3) = 0
(2*x*(4*x-3))/((x+4)*(4*x-3))+(3*x*(x+4))/((x+4)*(4*x-3)) = 0
2*x*(4*x-3)+3*x*(x+4) = 0
11*x^2+6*x = 0
11*x^2+6*x = 0
x*(11*x+6) = 0
11*x+6 = 0 // - 6
11*x = -6 // : 11
x = -6/11
x*(x+6/11) = 0
(x*(x+6/11))/((x+4)*(4*x-3)) = 0
(x*(x+6/11))/((x+4)*(4*x-3)) = 0 // * (x+4)*(4*x-3)
x*(x+6/11) = 0
( x+6/11 )
x+6/11 = 0 // - 6/11
x = -6/11
( x )
x = 0
x in { -6/11, 0 }
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