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m in (-oo:+oo)
13/30 = m+3/5 // - m+3/5
13/30-m-(3/5) = 0
13/30-m-3/5 = 0
-m-1/6 = 0 // + 1/6
-m = 1/6 // * -1
m = -1/6
m = -1/6
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