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n in (-oo:+oo)
35 = 5*n+4*n-10 // - 5*n+4*n-10
10-(5*n)-(4*n)+35 = 0
10-5*n-4*n+35 = 0
45-9*n = 0 // - 45
-9*n = -45 // : -9
n = -45/(-9)
n = 5
n = 5
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