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n in (-oo:+oo)
4/5 = (-9*n)/3 // - (-9*n)/3
4/5-((-9*n)/3) = 0
3*n+4/5 = 0
3*n+4/5 = 0 // - 4/5
3*n = -4/5 // : 3
n = -4/5/3
n = -4/15
n = -4/15
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