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a in (-oo:+oo)
(2/3)*a+2/3 = 22/3 // - 22/3
(2/3)*a+2/3-(22/3) = 0
(2/3)*a+2/3-22/3 = 0
2/3*a-20/3 = 0 // + 20/3
2/3*a = 20/3 // : 2/3
a = 20/3/2/3
a = 10
a = 10
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