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n in (-oo:+oo)
(1/4)*n-(7/8) = 0
(1/4)*n-7/8 = 0
1/4*n-7/8 = 0 // + 7/8
1/4*n = 7/8 // : 1/4
n = 7/8/1/4
n = 7/2
n = 7/2
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