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m in (-oo:+oo)
m-1/2 = 2*m-(13/10) // - 2*m-(13/10)
m-(2*m)-1/2+13/10 = 0
m-2*m-1/2+13/10 = 0
4/5-m = 0 // - 4/5
-m = -4/5 // * -1
m = 4/5
m = 4/5
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