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a in (-oo:+oo)
9-((1/2)*a) = (1/4)*a // - (1/4)*a
9-((1/2)*a)-((1/4)*a) = 0
(-1/2)*a+(-1/4)*a+9 = 0
9-3/4*a = 0 // - 9
-3/4*a = -9 // : -3/4
a = -9/(-3/4)
a = 12
a = 12
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