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n in (-oo:+oo)
(2/3)*n-(5/2) = -3 // + 3
(2/3)*n-(5/2)+3 = 0
(2/3)*n-5/2+3 = 0
2/3*n+1/2 = 0 // - 1/2
2/3*n = -1/2 // : 2/3
n = -1/2/2/3
n = -3/4
n = -3/4
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