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m in (-oo:+oo)
(1/2)*m-(2*m)-7 = 4*m-10 // - 4*m-10
(1/2)*m-(2*m)-(4*m)-7+10 = 0
(1/2)*m-2*m-4*m-7+10 = 0
3-11/2*m = 0 // - 3
-11/2*m = -3 // : -11/2
m = -3/(-11/2)
m = 6/11
m = 6/11
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