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m in (-oo:+oo)
m-(4*m)-(19/4)-(20/5) = 2 // - 2
m-(4*m)-(19/4)-(20/5)-2 = 0
m-4*m-19/4-4-2 = 0
-3*m-43/4 = 0 // + 43/4
-3*m = 43/4 // : -3
m = 43/4/(-3)
m = -43/12
m = -43/12
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