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a in (-oo:+oo)
(3/2)*a+(5/3)*a-((13/6)*a)-(2/3) = 5/6 // - 5/6
(3/2)*a+(5/3)*a-((13/6)*a)-(2/3)-(5/6) = 0
(3/2)*a+(5/3)*a+(-13/6)*a-2/3-5/6 = 0
a-3/2 = 0 // + 3/2
a = 3/2
a = 3/2
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