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n in (-oo:+oo)
(2/3)*n-(3/10) = n-59/30 // - n-59/30
(2/3)*n-n-(3/10)-(-59/30) = 0
(2/3)*n-n-3/10+59/30 = 0
5/3-1/3*n = 0 // - 5/3
-1/3*n = -5/3 // : -1/3
n = -5/3/(-1/3)
n = 5
n = 5
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