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m in (-oo:+oo)
1-3*m = -6*m-(5/4) // + -6*m-(5/4)
5/4-3*m-(-6*m)+1 = 0
6*m-3*m+5/4+1 = 0
3*m+9/4 = 0 // - 9/4
3*m = -9/4 // : 3
m = -9/4/3
m = -3/4
m = -3/4
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