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x in (-oo:+oo)
((5/4)*x+4)*(x/4-4) = 0
(5/4*x+4)*(1/4*x-4) = 0
( 1/4*x-4 )
1/4*x-4 = 0 // + 4
1/4*x = 4 // : 1/4
x = 4/1/4
x = 16
( 5/4*x+4 )
5/4*x+4 = 0 // - 4
5/4*x = -4 // : 5/4
x = -4/5/4
x = -16/5
x in { 16, -16/5 }
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