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n in (-oo:+oo)
n/5+9/5 = -2*n-9 // + -2*n-9
n/5-(-2*n)+9/5+9 = 0
n/5+2*n+9/5+9 = 0
11/5*n+54/5 = 0 // - 54/5
11/5*n = -54/5 // : 11/5
n = -54/5/11/5
n = -54/11
n = -54/11
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