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D( x )
8*x-3 = 0
2*x+2 = 0
8*x-3 = 0
8*x-3 = 0
8*x-3 = 0 // + 3
8*x = 3 // : 8
x = 3/8
2*x+2 = 0
2*x+2 = 0
2*x+2 = 0 // - 2
2*x = -2 // : 2
x = -2/2
x = -1
x in (-oo:-1) U (-1:3/8) U (3/8:+oo)
15/(8*x-3) = 1/(2*x+2) // - 1/(2*x+2)
15/(8*x-3)-(1/(2*x+2)) = 0
15/(8*x-3)-(2*x+2)^-1 = 0
15/(8*x-3)-1/(2*x+2) = 0
(15*(2*x+2))/((8*x-3)*(2*x+2))+(-1*(8*x-3))/((8*x-3)*(2*x+2)) = 0
15*(2*x+2)-1*(8*x-3) = 0
22*x+33 = 0
(22*x+33)/((8*x-3)*(2*x+2)) = 0
(22*x+33)/((8*x-3)*(2*x+2)) = 0 // * (8*x-3)*(2*x+2)
22*x+33 = 0
22*x+33 = 0 // - 33
22*x = -33 // : 22
x = -33/22
x = -3/2
x = -3/2
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