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n in (-oo:+oo)
(1/4)*n+5 = 51/2 // - 51/2
(1/4)*n-(51/2)+5 = 0
(1/4)*n-51/2+5 = 0
1/4*n-41/2 = 0 // + 41/2
1/4*n = 41/2 // : 1/4
n = 41/2/1/4
n = 82
n = 82
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