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D( x )
(4*x+3)^2 = 0
(4*x+3)^2 = 0
(4*x+3)^2 = 0
4*x+3 = 0 // - 3
4*x = -3 // : 4
x = -3/4
x in (-oo:-3/4) U (-3/4:+oo)
(9*(8*x+3)-(8*(9*x-8)))/((4*x+3)^2) = 0
(9*(8*x+3)-8*(9*x-8))/((4*x+3)^2) = 0
9*(8*x+3)-8*(9*x-8) = 0
9*(8*x+3)-8*(9*x-8) = 0
91 = 0
91 = 0
91/((4*x+3)^2) = 0
x belongs to the empty set
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