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m in (-oo:+oo)
-2.6*m = -3/7 // + -3/7
-2.6*m-(-3/7) = 0
3/7-2.6*m = 0
3/7-2.6*m = 0 // - 3/7
-2.6*m = -3/7 // : -2.6
m = -3/7/(-2.6)
m = 0.16483517
m = 0.16483517
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