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m in (-oo:+oo)
4/7 = m/35 // - m/35
4/7-(m/35) = 0
4/7-1/35*m = 0 // - 4/7
-1/35*m = -4/7 // : -1/35
m = -4/7/(-1/35)
m = 20
m = 20
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