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m in (-oo:+oo)
(-6/7)*m-(5/7) = -5 // + 5
(-6/7)*m-(5/7)+5 = 0
(-6/7)*m-5/7+5 = 0
30/7-6/7*m = 0 // - 30/7
-6/7*m = -30/7 // : -6/7
m = -30/7/(-6/7)
m = 5
m = 5
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