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m in (-oo:+oo)
(-1/7)*m+5 = 40/7 // - 40/7
(-1/7)*m-(40/7)+5 = 0
(-1/7)*m-40/7+5 = 0
-1/7*m-5/7 = 0 // + 5/7
-1/7*m = 5/7 // : -1/7
m = 5/7/(-1/7)
m = -5
m = -5
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