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n in (-oo:+oo)
n+n/3-(7/9) = n+2/6-3 // - n+2/6-3
n+n/3-n-(7/9)-(2/6)+3 = 0
n+n/3-n-7/9-1/3+3 = 0
1/3*n+17/9 = 0 // - 17/9
1/3*n = -17/9 // : 1/3
n = -17/9/1/3
n = -17/3
n = -17/3
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