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a in (-oo:+oo)
4/9-2*a = 6*a-(284/9) // - 6*a-(284/9)
4/9-2*a-(6*a)+284/9 = 0
4/9-2*a-6*a+284/9 = 0
32-8*a = 0 // - 32
-8*a = -32 // : -8
a = -32/(-8)
a = 4
a = 4
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