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a in (-oo:+oo)
(-1/2)*a+8 = 133/16 // - 133/16
(-1/2)*a-(133/16)+8 = 0
(-1/2)*a-133/16+8 = 0
-1/2*a-5/16 = 0 // + 5/16
-1/2*a = 5/16 // : -1/2
a = 5/16/(-1/2)
a = -5/8
a = -5/8
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