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a in (-oo:+oo)
3*a-a+2/9 = 38/9 // - 38/9
3*a-a+2/9-(38/9) = 0
3*a-a+2/9-38/9 = 0
2*a-4 = 0 // + 4
2*a = 4 // : 2
a = 4/2
a = 2
a = 2
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