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