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a in (-oo:+oo)
2/3-(2*a) = -64/3 // + -64/3
2/3-(2*a)-(-64/3) = 0
2/3-2*a+64/3 = 0
22-2*a = 0 // - 22
-2*a = -22 // : -2
a = -22/(-2)
a = 11
a = 11
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