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m in (-oo:+oo)
5/7 = m/35 // - m/35
5/7-(m/35) = 0
5/7-1/35*m = 0 // - 5/7
-1/35*m = -5/7 // : -1/35
m = -5/7/(-1/35)
m = 25
m = 25
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