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a in (-oo:+oo)
-6 = a/(-12)-5 // - a/(-12)-5
5-(a/(-12))-6 = 0
1/12*a-1 = 0 // + 1
1/12*a = 1 // : 1/12
a = 1/1/12
a = 12
a = 12
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