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n in (-oo:+oo)
n/7-5 = 15 // - 15
n/7-15-5 = 0
1/7*n-15-5 = 0 // + -15-5
1/7*n = -(-15-5) // : 1/7
n = (-(-15-5))/1/7
n = 7*(5+15)
n = 7*(5+15)
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