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n in (-oo:+oo)
10-5*n = 1-2*n // - 1-2*n
10-5*n-(-2*n)-1 = 0
2*n-5*n-1+10 = 0
9-3*n = 0 // - 9
-3*n = -9 // : -3
n = -9/(-3)
n = 3
n = 3
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