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a in (-oo:+oo)
-2*(2/3)*a = 6 // - 6
-2*(2/3)*a-6 = 0
-4/3*a-6 = 0 // + 6
-4/3*a = 6 // : -4/3
a = 6/(-4/3)
a = -9/2
a = -9/2
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