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a in (-oo:+oo)
a/2-((4*a)/6) = a+6/2 // - a+6/2
a/2-((4*a)/6)-a-(6/2) = 0
a/2+(-2/3)*a-a-3 = 0
-7/6*a-3 = 0 // + 3
-7/6*a = 3 // : -7/6
a = 3/(-7/6)
a = -18/7
a = -18/7
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