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a in (-oo:+oo)
5*a-7/8 = -61/24 // + -61/24
5*a-7/8-(-61/24) = 0
5*a-7/8+61/24 = 0
5*a+5/3 = 0 // - 5/3
5*a = -5/3 // : 5
a = -5/3/5
a = -1/3
a = -1/3
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