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a in (-oo:+oo)
(-2/3)*a+6 = 20/3 // - 20/3
(-2/3)*a-(20/3)+6 = 0
(-2/3)*a-20/3+6 = 0
-2/3*a-2/3 = 0 // + 2/3
-2/3*a = 2/3 // : -2/3
a = 2/3/(-2/3)
a = -1
a = -1
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