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D( x )
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
x in (-oo:-3/2) U (-3/2:+oo)
(7-(8*x^2))/(2*x+3) = 0
(7-8*x^2)/(2*x+3) = 0
-8*x^2 = -7 // : -8
x^2 = 7/8
x^2 = 7/8 // ^ 1/2
abs(x) = (7/8)^(1/2)
x = (7/8)^(1/2) or x = -(7/8)^(1/2)
x in { (7/8)^(1/2), -(7/8)^(1/2) }
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