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a in (-oo:+oo)
2/9 = 2*a-(16/9) // - 2*a-(16/9)
2/9-(2*a)+16/9 = 0
2/9-2*a+16/9 = 0
2-2*a = 0 // - 2
-2*a = -2 // : -2
a = -2/(-2)
a = 1
a = 1
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