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a in (-oo:+oo)
(2*a)/9-(a/2) = -10/3 // + -10/3
(2*a)/9-(a/2)-(-10/3) = 0
(2*a)/9-(a/2)+10/3 = 0
10/3-5/18*a = 0 // - 10/3
-5/18*a = -10/3 // : -5/18
a = -10/3/(-5/18)
a = 12
a = 12
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