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m in (-oo:+oo)
29/40 = m+3/5 // - m+3/5
29/40-m-(3/5) = 0
29/40-m-3/5 = 0
1/8-m = 0 // - 1/8
-m = -1/8 // * -1
m = 1/8
m = 1/8
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