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n in (-oo:+oo)
2*(10-(n/13)) = 12 // - 12
2*(10-(n/13))-12 = 0
2*(10-1/13*n)-12 = 0
2*(10-1/13*n)-12 = 0
8-2/13*n = 0
8-2/13*n = 0
8-2/13*n = 0 // - 8
-2/13*n = -8 // : -2/13
n = -8/(-2/13)
n = 52
n = 52
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