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