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m in (-oo:+oo)
10-((5/7)*m) = 55/7 // - 55/7
10-((5/7)*m)-(55/7) = 0
(-5/7)*m-55/7+10 = 0
15/7-5/7*m = 0 // - 15/7
-5/7*m = -15/7 // : -5/7
m = -15/7/(-5/7)
m = 3
m = 3
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