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