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n in (-oo:+oo)
n/15 = 21/12 // - 21/12
n/15-(21/12) = 0
n/15-7/4 = 0
1/15*n-7/4 = 0 // + 7/4
1/15*n = 7/4 // : 1/15
n = 7/4/1/15
n = 105/4
n = 105/4
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