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N in (-oo:+oo)
(1/3)*(4-N) = 7 // - 7
(1/3)*(4-N)-7 = 0
1/3*(4-N)-7 = 0
1/3*(4-N)-7 = 0
-1/3*N-17/3 = 0
-1/3*N-17/3 = 0
-1/3*N-17/3 = 0 // + 17/3
-1/3*N = 17/3 // : -1/3
N = 17/3/(-1/3)
N = -17
N = -17
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