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a in (-oo:+oo)
(7/9)*a-((5/6)*a) = 3 // - 3
(7/9)*a-((5/6)*a)-3 = 0
(7/9)*a+(-5/6)*a-3 = 0
-1/18*a-3 = 0 // + 3
-1/18*a = 3 // : -1/18
a = 3/(-1/18)
a = -54
a = -54
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