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D( x )
4*x-(5*((9*x)/16)) = 0
4*x-(5*((9*x)/16)) = 0
4*x-(5*((9*x)/16)) = 0
4*x+(-45/16)*x = 0
19/16*x = 0 // : 19/16
x = 0
x in (-oo:0) U (0:+oo)
(3*x-(4*((9*x)/16)))/(4*x-(5*((9*x)/16))) = 0
(3*x+(-9/4)*x)/(4*x+(-45/16)*x) = 0
(3/4*x)/(19/16*x) = 0
3/4*x = 0 // : 3/4
x = 0
x in { 0}
x belongs to the empty set
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