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n in (-oo:+oo)
(3*(n+3))/2 = 23 // - 23
(3*(n+3))/2-23 = 0
(3*(n+3))/2+(-23*2)/2 = 0
3*(n+3)-23*2 = 0
3*n-37 = 0
(3*n-37)/2 = 0
(3*n-37)/2 = 0 // * 2
3*n-37 = 0
3*n-37 = 0 // + 37
3*n = 37 // : 3
n = 37/3
n = 37/3
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