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a in (-oo:+oo)
a/9 = 7/10 // - 7/10
a/9-(7/10) = 0
a/9-7/10 = 0
1/9*a-7/10 = 0 // + 7/10
1/9*a = 7/10 // : 1/9
a = 7/10/1/9
a = 63/10
a = 63/10
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