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a in (-oo:+oo)
a/2-a-(2/4) = 9/4 // - 9/4
a/2-a-(2/4)-(9/4) = 0
a/2-a-1/2-9/4 = 0
-1/2*a-11/4 = 0 // + 11/4
-1/2*a = 11/4 // : -1/2
a = 11/4/(-1/2)
a = -11/2
a = -11/2
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