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m in (-oo:+oo)
-(7*m)-1/4 = (-5/7)*m+169/28 // - (-5/7)*m+169/28
-(7*m)-((-5/7)*m)-1/4-(169/28) = 0
(5/7)*m-7*m-1/4-169/28 = 0
-44/7*m-44/7 = 0 // + 44/7
-44/7*m = 44/7 // : -44/7
m = 44/7/(-44/7)
m = -1
m = -1
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