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a in (-oo:+oo)
-4*a-(1/4) = -193/4 // + -193/4
-4*a-(1/4)-(-193/4) = 0
193/4-4*a-1/4 = 0
48-4*a = 0 // - 48
-4*a = -48 // : -4
a = -48/(-4)
a = 12
a = 12
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