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n in (-oo:+oo)
(1/3)*n-(4*((2/3)*n-3)) = (2/3)*n-6 // - (2/3)*n-6
(1/3)*n-(4*((2/3)*n-3))-((2/3)*n)+6 = 0
(1/3)*n-4*((2/3)*n-3)+(-2/3)*n+6 = 0
n/3-4*(2/3*n-3)+(-2*n)/3+6 = 0
(-4*3*(2/3*n-3))/3+n/3+(-2*n)/3+(3*6)/3 = 0
n-4*3*(2/3*n-3)-2*n+3*6 = 0
18-7*n-2*n+36 = 0
18-9*n+36 = 0
54-9*n = 0
(54-9*n)/3 = 0
(54-9*n)/3 = 0 // * 3
54-9*n = 0
54-9*n = 0 // - 54
-9*n = -54 // : -9
n = -54/(-9)
n = 6
n = 6
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