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a in (-oo:+oo)
(1/4)*a-((5/6)*a)-(4/9) = 0
(1/4)*a+(-5/6)*a-4/9 = 0
-7/12*a-4/9 = 0 // + 4/9
-7/12*a = 4/9 // : -7/12
a = 4/9/(-7/12)
a = -16/21
a = -16/21
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