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n in (-oo:+oo)
4-4*n = 5*n+49 // - 5*n+49
4-4*n-(5*n)-49 = 0
4-4*n-5*n-49 = 0
-9*n-45 = 0 // + 45
-9*n = 45 // : -9
n = 45/(-9)
n = -5
n = -5
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