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n in (-oo:+oo)
10-n = -5*n-18 // + -5*n-18
10-n-(-5*n)+18 = 0
5*n-n+10+18 = 0
4*n+28 = 0 // - 28
4*n = -28 // : 4
n = -28/4
n = -7
n = -7
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