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a in (-oo:+oo)
-(4*a)-7/8 = -85/24 // + -85/24
-(4*a)-7/8-(-85/24) = 0
85/24-4*a-7/8 = 0
8/3-4*a = 0 // - 8/3
-4*a = -8/3 // : -4
a = -8/3/(-4)
a = 2/3
a = 2/3
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