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a in (-oo:+oo)
2*a+5/9 = -3 // + 3
2*a+5/9+3 = 0
2*a+32/9 = 0 // - 32/9
2*a = -32/9 // : 2
a = -32/9/2
a = -16/9
a = -16/9
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