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x in (-oo:+oo)
(2*x)/y = 4*a // - 4*a
(2*x)/y-(4*a) = 0
(2*x)/y-4*a = 0
2*x*y^-1-4*a = 0 // + -4*a
2*x*y^-1 = -(-4*a) // : 2*y^-1
x = (-(-4*a))/(2*y^-1)
x = 2*a*y
x = 2*a*y
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