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n in (-oo:+oo)
2*n-(2/3) = 40/3 // - 40/3
2*n-(2/3)-(40/3) = 0
2*n-2/3-40/3 = 0
2*n-14 = 0 // + 14
2*n = 14 // : 2
n = 14/2
n = 7
n = 7
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