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n in (-oo:+oo)
n/2-(2/3) = 5/6 // - 5/6
n/2-(2/3)-(5/6) = 0
n/2-2/3-5/6 = 0
1/2*n-3/2 = 0 // + 3/2
1/2*n = 3/2 // : 1/2
n = 3/2/1/2
n = 3
n = 3
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