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m in (-oo:+oo)
2*m-1 = -2*m-13 // + -2*m-13
2*m-(-2*m)-1+13 = 0
2*m+2*m-1+13 = 0
4*m+12 = 0 // - 12
4*m = -12 // : 4
m = -12/4
m = -3
m = -3
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