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n in (-oo:+oo)
(1/4)*n+10 = 25/2 // - 25/2
(1/4)*n-(25/2)+10 = 0
(1/4)*n-25/2+10 = 0
1/4*n-5/2 = 0 // + 5/2
1/4*n = 5/2 // : 1/4
n = 5/2/1/4
n = 10
n = 10
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