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a in (-oo:+oo)
(2/3)*a-a-9 = -101/11 // + -101/11
(2/3)*a-a-(-101/11)-9 = 0
(2/3)*a-a+101/11-9 = 0
2/11-1/3*a = 0 // - 2/11
-1/3*a = -2/11 // : -1/3
a = -2/11/(-1/3)
a = 6/11
a = 6/11
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