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a in (-oo:+oo)
7*a+3 = 73/8 // - 73/8
7*a-(73/8)+3 = 0
7*a-73/8+3 = 0
7*a-49/8 = 0 // + 49/8
7*a = 49/8 // : 7
a = 49/8/7
a = 7/8
a = 7/8
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