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a in (-oo:+oo)
2*a = 7/8 // - 7/8
2*a-(7/8) = 0
2*a-7/8 = 0
2*a-7/8 = 0 // + 7/8
2*a = 7/8 // : 2
a = 7/8/2
a = 7/16
a = 7/16
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