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n in (-oo:+oo)
3*n+1 = -5*n-55 // + -5*n-55
3*n-(-5*n)+1+55 = 0
3*n+5*n+1+55 = 0
8*n+56 = 0 // - 56
8*n = -56 // : 8
n = -56/8
n = -7
n = -7
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