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n in (-oo:+oo)
(-2/5)*n+4 = 176/45 // - 176/45
(-2/5)*n-(176/45)+4 = 0
(-2/5)*n-176/45+4 = 0
4/45-2/5*n = 0 // - 4/45
-2/5*n = -4/45 // : -2/5
n = -4/45/(-2/5)
n = 2/9
n = 2/9
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