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