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n in (-oo:+oo)
(-1/4)*(n+12) = 7 // - 7
(-1/4)*(n+12)-7 = 0
-1/4*(n+12)-7 = 0
-1/4*(n+12)-7 = 0
-1/4*n-10 = 0
-1/4*n-10 = 0
-1/4*n-10 = 0 // + 10
-1/4*n = 10 // : -1/4
n = 10/(-1/4)
n = -40
n = -40
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