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n in (-oo:+oo)
(-3/5)*n-6 = -18/5 // + -18/5
(-3/5)*n-(-18/5)-6 = 0
(-3/5)*n+18/5-6 = 0
-3/5*n-12/5 = 0 // + 12/5
-3/5*n = 12/5 // : -3/5
n = 12/5/(-3/5)
n = -4
n = -4
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