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a in (-oo:+oo)
1/2-(9/4) = a/3 // - a/3
1/2-(a/3)-(9/4) = 0
1/2-(a/3)-9/4 = 0
-1/3*a-7/4 = 0 // + 7/4
-1/3*a = 7/4 // : -1/3
a = 7/4/(-1/3)
a = -21/4
a = -21/4
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