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a in (-oo:+oo)
-6*a-1 = 7*a+12 // - 7*a+12
-6*a-(7*a)-12-1 = 0
-6*a-7*a-12-1 = 0
-13*a-13 = 0 // + 13
-13*a = 13 // : -13
a = 13/(-13)
a = -1
a = -1
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