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n in (-oo:+oo)
(2*n+6)/2-3 = 6 // - 6
(2*n+6)/2-6-3 = 0
(2*n+6)/2+(-6*2)/2+(-3*2)/2 = 0
2*n-6*2-3*2+6 = 0
2*n-6-6 = 0
2*n-12 = 0
(2*n-12)/2 = 0
(2*n-12)/2 = 0 // * 2
2*n-12 = 0
2*n-12 = 0 // + 12
2*n = 12 // : 2
n = 12/2
n = 6
n = 6
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