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a in (-oo:+oo)
a/9 = 10/7 // - 10/7
a/9-(10/7) = 0
a/9-10/7 = 0
1/9*a-10/7 = 0 // + 10/7
1/9*a = 10/7 // : 1/9
a = 10/7/1/9
a = 90/7
a = 90/7
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