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a in (-oo:+oo)
7/9-(2*a) = 3*a+547/9 // - 3*a+547/9
7/9-(2*a)-(3*a)-(547/9) = 0
7/9-2*a-3*a-547/9 = 0
-5*a-60 = 0 // + 60
-5*a = 60 // : -5
a = 60/(-5)
a = -12
a = -12
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