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n in (-oo:+oo)
n/15 = 7-(n/15) // - 7-(n/15)
n/15+n/15-7 = 0
2/15*n-7 = 0 // + 7
2/15*n = 7 // : 2/15
n = 7/2/15
n = 105/2
n = 105/2
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