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m in (-oo:+oo)
5*m-14 = 28/2 // - 28/2
5*m-(28/2)-14 = 0
5*m-14-14 = 0
5*m-28 = 0 // + 28
5*m = 28 // : 5
m = 28/5
m = 28/5
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