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