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m in (-oo:+oo)
m/2 = m+4/7 // - m+4/7
m/2-m-(4/7) = 0
m/2-m-4/7 = 0
-1/2*m-4/7 = 0 // + 4/7
-1/2*m = 4/7 // : -1/2
m = 4/7/(-1/2)
m = -8/7
m = -8/7
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