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a in (-oo:+oo)
(2/3)*a+2/3 = 4 // - 4
(2/3)*a+2/3-4 = 0
2/3*a-10/3 = 0 // + 10/3
2/3*a = 10/3 // : 2/3
a = 10/3/2/3
a = 5
a = 5
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