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n in (-oo:+oo)
-1 = 5*n+4*n-10 // - 5*n+4*n-10
10-(5*n)-(4*n)-1 = 0
10-5*n-4*n-1 = 0
9-9*n = 0 // - 9
-9*n = -9 // : -9
n = -9/(-9)
n = 1
n = 1
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