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m in (-oo:+oo)
(-6/7)*m = 48/7 // - 48/7
(-6/7)*m-(48/7) = 0
(-6/7)*m-48/7 = 0
-6/7*m-48/7 = 0 // + 48/7
-6/7*m = 48/7 // : -6/7
m = 48/7/(-6/7)
m = -8
m = -8
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