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