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m in (-oo:+oo)
m-(5*m)-(19/4)-(31/7) = 2 // - 2
m-(5*m)-(19/4)-(31/7)-2 = 0
m-5*m-19/4-31/7-2 = 0
-4*m-313/28 = 0 // + 313/28
-4*m = 313/28 // : -4
m = 313/28/(-4)
m = -313/112
m = -313/112
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