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a in (-oo:+oo)
94/9 = 6*a+2*a+6 // - 6*a+2*a+6
94/9-(6*a)-(2*a)-6 = 0
94/9-6*a-2*a-6 = 0
40/9-8*a = 0 // - 40/9
-8*a = -40/9 // : -8
a = -40/9/(-8)
a = 5/9
a = 5/9
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