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x in (-oo:+oo)
((5*x)/20)*y = (4*x)/y // - (4*x)/y
((5*x)/20)*y-((4*x)/y) = 0
((5*x)/20)*y-4*x*y^-1 = 0
-4*x*y^-1 = 0 // : -4*y^-1
x = 0
x = 0
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