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a in (-oo:+oo)
a/7 = 9/8 // - 9/8
a/7-(9/8) = 0
a/7-9/8 = 0
1/7*a-9/8 = 0 // + 9/8
1/7*a = 9/8 // : 1/7
a = 9/8/1/7
a = 63/8
a = 63/8
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