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a in (-oo:+oo)
7/3 = a/2 // - a/2
7/3-(a/2) = 0
7/3-1/2*a = 0 // - 7/3
-1/2*a = -7/3 // : -1/2
a = -7/3/(-1/2)
a = 14/3
a = 14/3
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