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D( x )
4*x-5 = 0
4*x-5 = 0
4*x-5 = 0
4*x-5 = 0 // + 5
4*x = 5 // : 4
x = 5/4
x in (-oo:5/4) U (5/4:+oo)
8-(3/(4*x-5)) = 0
8-3*(4*x-5)^-1 = 0
8-3/(4*x-5) = 0
(8*(4*x-5))/(4*x-5)-3/(4*x-5) = 0
8*(4*x-5)-3 = 0
32*x-43 = 0
(32*x-43)/(4*x-5) = 0
(32*x-43)/(4*x-5) = 0 // * 4*x-5
32*x-43 = 0
32*x-43 = 0 // + 43
32*x = 43 // : 32
x = 43/32
x = 43/32
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