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a in (-oo:+oo)
6*(8-1*a) = -24 // + 24
6*(8-1*a)+24 = 0
6*(8-a)+24 = 0
6*(8-a)+24 = 0
72-6*a = 0
72-6*a = 0
72-6*a = 0 // - 72
-6*a = -72 // : -6
a = -72/(-6)
a = 12
a = 12
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