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m in (-oo:+oo)
m-(5*m)-(13/3)-(20/5) = 1 // - 1
m-(5*m)-(13/3)-(20/5)-1 = 0
m-5*m-13/3-4-1 = 0
-4*m-28/3 = 0 // + 28/3
-4*m = 28/3 // : -4
m = 28/3/(-4)
m = -7/3
m = -7/3
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