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a in (-oo:+oo)
1/8-4*a = -a-23/8 // + -a-23/8
a-4*a+1/8-(-23/8) = 0
a-4*a+1/8+23/8 = 0
3-3*a = 0 // - 3
-3*a = -3 // : -3
a = -3/(-3)
a = 1
a = 1
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