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