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a in (-oo:+oo)
9-((1/2)*a) = 4*a+5 // - 4*a+5
9-((1/2)*a)-(4*a)-5 = 0
(-1/2)*a-4*a-5+9 = 0
4-9/2*a = 0 // - 4
-9/2*a = -4 // : -9/2
a = -4/(-9/2)
a = 8/9
a = 8/9
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