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n in (-oo:+oo)
9/10-n = 123/70 // - 123/70
9/10-n-(123/70) = 0
9/10-n-123/70 = 0
-n-6/7 = 0 // + 6/7
-n = 6/7 // * -1
n = -6/7
n = -6/7
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