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