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n in (-oo:+oo)
45.49 = (1/2)*n+5 // - (1/2)*n+5
45.49-((1/2)*n)-5 = 0
(-1/2)*n-5+45.49 = 0
40.49-1/2*n = 0 // - 40.49
-1/2*n = -40.49 // : -1/2
n = -40.49/(-1/2)
n = 80.98
n = 80.98
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