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m in (-oo:+oo)
-3 = m+8/5 // - m+8/5
-m-(8/5)-3 = 0
-m-8/5-3 = 0
-m-23/5 = 0 // + 23/5
-m = 23/5 // * -1
m = -23/5
m = -23/5
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