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a in (-oo:+oo)
a/7+9 = 6/7 // - 6/7
a/7-(6/7)+9 = 0
a/7-6/7+9 = 0
1/7*a+57/7 = 0 // - 57/7
1/7*a = -57/7 // : 1/7
a = -57/7/1/7
a = -57
a = -57
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