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a in (-oo:+oo)
(4/9)*a = (1/9)*a+5/6 // - (1/9)*a+5/6
(4/9)*a-((1/9)*a)-(5/6) = 0
(4/9)*a+(-1/9)*a-5/6 = 0
1/3*a-5/6 = 0 // + 5/6
1/3*a = 5/6 // : 1/3
a = 5/6/1/3
a = 5/2
a = 5/2
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