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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-65/28 = 0 // + 65/28
-4*m = 65/28 // : -4
m = 65/28/(-4)
m = -65/112
m = -65/112
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