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n in (-oo:+oo)
-5*n-7 = -43/9 // + -43/9
-5*n-(-43/9)-7 = 0
43/9-5*n-7 = 0
-5*n-20/9 = 0 // + 20/9
-5*n = 20/9 // : -5
n = 20/9/(-5)
n = -4/9
n = -4/9
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