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D( x )
40*x+5 = 0
40*x+5 = 0
40*x+5 = 0
40*x+5 = 0 // - 5
40*x = -5 // : 40
x = -5/40
x = -1/8
x in (-oo:-1/8) U (-1/8:+oo)
(64*x-33)/(40*x+5) = 0
64*x-33 = 0 // + 33
64*x = 33 // : 64
x = 33/64
x = 33/64
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