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n in (-oo:+oo)
(3*n+7)/2 = 3*(3-n) // - 3*(3-n)
(3*n+7)/2-(3*(3-n)) = 0
(3*n+7)/2-3*(3-n) = 0
(3*n+7)/2+(-3*2*(3-n))/2 = 0
3*n-3*2*(3-n)+7 = 0
9*n-11 = 0
(9*n-11)/2 = 0
(9*n-11)/2 = 0 // * 2
9*n-11 = 0
9*n-11 = 0 // + 11
9*n = 11 // : 9
n = 11/9
n = 11/9
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