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n in (-oo:+oo)
7*n-1/4 = 5 // - 5
7*n-1/4-5 = 0
7*n-21/4 = 0 // + 21/4
7*n = 21/4 // : 7
n = 21/4/7
n = 3/4
n = 3/4
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