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n in (-oo:+oo)
(-2/5)*n+7 = 19/5 // - 19/5
(-2/5)*n-(19/5)+7 = 0
(-2/5)*n-19/5+7 = 0
16/5-2/5*n = 0 // - 16/5
-2/5*n = -16/5 // : -2/5
n = -16/5/(-2/5)
n = 8
n = 8
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