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x in (-oo:+oo)
y = 5/3-x // - 5/3-x
x+y-(5/3) = 0
x+y-5/3 = 0
x+y-5/3 = 0 // - y-5/3
x = -(y-5/3)
x = 5/3-y
x = 5/3-y
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