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n in (-oo:+oo)
12-((4/5)*(n+5)) = 66 // - 66
12-((4/5)*(n+5))-66 = 0
(-4/5)*(n+5)-66+12 = 0
12-4/5*(n+5)-66 = 0
12-4/5*(n+5)-66 = 0
12-4/5*n-70 = 0
-4/5*n-58 = 0
-4/5*n-58 = 0
-4/5*n-58 = 0 // + 58
-4/5*n = 58 // : -4/5
n = 58/(-4/5)
n = -145/2
n = -145/2
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