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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)
12*((2*x-5)/(4*x+5)) = 0
(12*(2*x-5))/(4*x+5) = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x = 5/2
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