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n in (-oo:+oo)
n/2+n/5 = 2/3 // - 2/3
n/2+n/5-(2/3) = 0
n/2+n/5-2/3 = 0
7/10*n-2/3 = 0 // + 2/3
7/10*n = 2/3 // : 7/10
n = 2/3/7/10
n = 20/21
n = 20/21
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