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m in (-oo:+oo)
(-2/5)*m = -6/7 // + -6/7
(-2/5)*m-(-6/7) = 0
(-2/5)*m+6/7 = 0
6/7-2/5*m = 0 // - 6/7
-2/5*m = -6/7 // : -2/5
m = -6/7/(-2/5)
m = 15/7
m = 15/7
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