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x in (-oo:+oo)
x = (-5/31)*n // - (-5/31)*n
x-((-5/31)*n) = 0
(5/31)*n+x = 0
5/31*n+x = 0 // - 5/31*n
x = -(5/31*n)
x = -5/31*n
x = -5/31*n
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