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n in (-oo:+oo)
(3*n)/5 = 4*n-102 // - 4*n-102
(3*n)/5-(4*n)+102 = 0
(3*n)/5-4*n+102 = 0
102-17/5*n = 0 // - 102
-17/5*n = -102 // : -17/5
n = -102/(-17/5)
n = 30
n = 30
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