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x in (-oo:+oo)
-((5/2)*(2*x-(4*y))) = 0
-((5/2)*(2*x-4*y)) = 0
-1*5/2*(2*x-4*y) = 0
( -1 )
-1 = 0
x belongs to the empty set
( 2*x-4*y )
2*x-4*y = 0 // + -4*y
2*x = -(-4*y) // : 2
x = (-(-4*y))/2
x = 2*y
( 5/2 )
5/2 = 0
x belongs to the empty set
x = 2*y
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