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n in (-oo:+oo)
2*n+1 = 15-5*n // - 15-5*n
2*n-(-5*n)-15+1 = 0
2*n+5*n-15+1 = 0
7*n-14 = 0 // + 14
7*n = 14 // : 7
n = 14/7
n = 2
n = 2
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