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n in (-oo:+oo)
(1/2)*(2*n+6) = 4*(n-3) // - 4*(n-3)
(1/2)*(2*n+6)-(4*(n-3)) = 0
(1/2)*(2*n+6)-4*(n-3) = 0
1/2*(2*n+6)-4*(n-3) = 0
1/2*(2*n+6)-4*(n-3) = 0
15-3*n = 0
15-3*n = 0
15-3*n = 0 // - 15
-3*n = -15 // : -3
n = -15/(-3)
n = 5
n = 5
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