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m in (-oo:+oo)
-(3*m)-1 = -9/4 // + -9/4
-(3*m)-(-9/4)-1 = 0
9/4-3*m-1 = 0
5/4-3*m = 0 // - 5/4
-3*m = -5/4 // : -3
m = -5/4/(-3)
m = 5/12
m = 5/12
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