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a in (-oo:+oo)
2*a-(7*a)+6 = 23/3 // - 23/3
2*a-(7*a)-(23/3)+6 = 0
2*a-7*a-23/3+6 = 0
-5*a-5/3 = 0 // + 5/3
-5*a = 5/3 // : -5
a = 5/3/(-5)
a = -1/3
a = -1/3
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