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