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a in (-oo:+oo)
(2/3)*a = 20/33 // - 20/33
(2/3)*a-(20/33) = 0
(2/3)*a-20/33 = 0
2/3*a-20/33 = 0 // + 20/33
2/3*a = 20/33 // : 2/3
a = 20/33/2/3
a = 10/11
a = 10/11
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