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D( x )
9-(4*x) = 0
9-(4*x) = 0
9-(4*x) = 0
9-4*x = 0
9-4*x = 0 // - 9
-4*x = -9 // : -4
x = -9/(-4)
x = 9/4
x in (-oo:9/4) U (9/4:+oo)
2/3-(7/(9-(4*x))) = -(9/(9-(4*x))) // + 9/(9-(4*x))
9/(9-(4*x))-(7/(9-(4*x)))+2/3 = 0
9/(9-4*x)-7*(9-4*x)^-1+2/3 = 0
9/(9-4*x)-7/(9-4*x)+2/3 = 0
(-7*3)/(3*(9-4*x))+(3*9)/(3*(9-4*x))+(2*(9-4*x))/(3*(9-4*x)) = 0
2*(9-4*x)-7*3+3*9 = 0
6-8*x+18 = 0
24-8*x = 0
(24-8*x)/(3*(9-4*x)) = 0
(24-8*x)/(3*(9-4*x)) = 0 // * 3*(9-4*x)
24-8*x = 0
24-8*x = 0 // - 24
-8*x = -24 // : -8
x = -24/(-8)
x = 3
x = 3
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