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a in (-oo:+oo)
6 = 8*(a-(1/4))-20 // - 8*(a-(1/4))-20
6-(8*(a-(1/4)))+20 = 0
6-8*(a-1/4)+20 = 0
6-8*(a-1/4)+20 = 0
8-8*a+20 = 0
28-8*a = 0
28-8*a = 0
28-8*a = 0 // - 28
-8*a = -28 // : -8
a = -28/(-8)
a = 7/2
a = 7/2
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