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m in (-oo:+oo)
m/(-7) = 4/5 // - 4/5
m/(-7)-(4/5) = 0
m/(-7)-4/5 = 0
-1/7*m-4/5 = 0 // + 4/5
-1/7*m = 4/5 // : -1/7
m = 4/5/(-1/7)
m = -28/5
m = -28/5
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