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m in (-oo:+oo)
m+2/3 = 2*m-(1/5) // - 2*m-(1/5)
m-(2*m)+2/3+1/5 = 0
m-2*m+2/3+1/5 = 0
13/15-m = 0 // - 13/15
-m = -13/15 // * -1
m = 13/15
m = 13/15
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