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