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