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n in (-oo:+oo)
(3/5)*n = -27/5 // + -27/5
(3/5)*n-(-27/5) = 0
(3/5)*n+27/5 = 0
3/5*n+27/5 = 0 // - 27/5
3/5*n = -27/5 // : 3/5
n = -27/5/3/5
n = -9
n = -9
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