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a in (-oo:+oo)
(1/6)*a+(1/12)*a+(1/2)*a+4+5 = a // - a
(1/6)*a+(1/12)*a+(1/2)*a-a+4+5 = 0
9-1/4*a = 0 // - 9
-1/4*a = -9 // : -1/4
a = -9/(-1/4)
a = 36
a = 36
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