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m in (-oo:+oo)
-(4*m)-1 = -19/7 // + -19/7
-(4*m)-(-19/7)-1 = 0
19/7-4*m-1 = 0
12/7-4*m = 0 // - 12/7
-4*m = -12/7 // : -4
m = -12/7/(-4)
m = 3/7
m = 3/7
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