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a in (-oo:+oo)
(5/9)*a = (4/9)*a+6 // - (4/9)*a+6
(5/9)*a-((4/9)*a)-6 = 0
(5/9)*a+(-4/9)*a-6 = 0
1/9*a-6 = 0 // + 6
1/9*a = 6 // : 1/9
a = 6/1/9
a = 54
a = 54
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