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a in (-oo:+oo)
a/9-(a/2) = -7/3 // + -7/3
a/9-(a/2)-(-7/3) = 0
a/9-(a/2)+7/3 = 0
7/3-7/18*a = 0 // - 7/3
-7/18*a = -7/3 // : -7/18
a = -7/3/(-7/18)
a = 6
a = 6
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