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n in (-oo:+oo)
8 = (-4/7)*n // - (-4/7)*n
8-((-4/7)*n) = 0
(4/7)*n+8 = 0
4/7*n+8 = 0 // - 8
4/7*n = -8 // : 4/7
n = -8/4/7
n = -14
n = -14
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