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a in (-oo:+oo)
4/9-3*a = -185/9 // + -185/9
4/9-3*a-(-185/9) = 0
4/9-3*a+185/9 = 0
21-3*a = 0 // - 21
-3*a = -21 // : -3
a = -21/(-3)
a = 7
a = 7
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