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D( x )
3-(2*x) = 0
4*x+6 = 0
3-(2*x) = 0
3-(2*x) = 0
3-2*x = 0
3-2*x = 0 // - 3
-2*x = -3 // : -2
x = -3/(-2)
x = 3/2
4*x+6 = 0
4*x+6 = 0
4*x+6 = 0 // - 6
4*x = -6 // : 4
x = -6/4
x = -3/2
x in (-oo:-3/2) U (-3/2:3/2) U (3/2:+oo)
5/(4*x+6) = 10/(3-(2*x)) // - 10/(3-(2*x))
5/(4*x+6)-(10/(3-(2*x))) = 0
5/(4*x+6)-10*(3-2*x)^-1 = 0
5/(4*x+6)-10/(3-2*x) = 0
(5*(3-2*x))/((4*x+6)*(3-2*x))+(-10*(4*x+6))/((4*x+6)*(3-2*x)) = 0
5*(3-2*x)-10*(4*x+6) = 0
-50*x-45 = 0
(-50*x-45)/((4*x+6)*(3-2*x)) = 0
(-50*x-45)/((4*x+6)*(3-2*x)) = 0 // * (4*x+6)*(3-2*x)
-50*x-45 = 0
-50*x-45 = 0 // + 45
-50*x = 45 // : -50
x = 45/(-50)
x = -9/10
x = -9/10
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