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n in (-oo:+oo)
n/28 = 7/8 // - 7/8
n/28-(7/8) = 0
n/28-7/8 = 0
1/28*n-7/8 = 0 // + 7/8
1/28*n = 7/8 // : 1/28
n = 7/8/1/28
n = 49/2
n = 49/2
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