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n in (-oo:+oo)
(2/3)*n = -8/15 // + -8/15
(2/3)*n-(-8/15) = 0
(2/3)*n+8/15 = 0
2/3*n+8/15 = 0 // - 8/15
2/3*n = -8/15 // : 2/3
n = -8/15/2/3
n = -4/5
n = -4/5
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