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n in (-oo:+oo)
(2/3)*(9*n-21)+5*n = 0
2/3*(9*n-21)+5*n = 0
2/3*(9*n-21)+5*n = 0
11*n-14 = 0
11*n-14 = 0
11*n-14 = 0 // + 14
11*n = 14 // : 11
n = 14/11
n = 14/11
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