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n in (-oo:+oo)
15/4-2*n = 7/2 // - 7/2
15/4-2*n-(7/2) = 0
15/4-2*n-7/2 = 0
1/4-2*n = 0 // - 1/4
-2*n = -1/4 // : -2
n = -1/4/(-2)
n = 1/8
n = 1/8
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