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x in (-oo:+oo)
y = 10/4-x // - 10/4-x
x+y-(10/4) = 0
x+y-5/2 = 0
x+y-5/2 = 0 // - y-5/2
x = -(y-5/2)
x = 5/2-y
x = 5/2-y
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