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a in (-oo:+oo)
11/4 = a+3/8 // - a+3/8
11/4-a-(3/8) = 0
11/4-a-3/8 = 0
19/8-a = 0 // - 19/8
-a = -19/8 // * -1
a = 19/8
a = 19/8
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