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a in (-oo:+oo)
8-(6*a) = 68 // - 68
8-(6*a)-68 = 0
8-6*a-68 = 0
-6*a-60 = 0 // + 60
-6*a = 60 // : -6
a = 60/(-6)
a = -10
a = -10
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