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a in (-oo:+oo)
a = 4/9-((7*(2/9))/2) // - 4/9-((7*(2/9))/2)
a-(4/9)+(7*(2/9))/2 = 0
a-4/9+(7*(2/9))/2 = 0
a+1/3 = 0 // - 1/3
a = -1/3
a = -1/3
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