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m in (-oo:+oo)
1/9-(m/7) = 5/63 // - 5/63
1/9-(m/7)-(5/63) = 0
1/9-(m/7)-5/63 = 0
2/63-1/7*m = 0 // - 2/63
-1/7*m = -2/63 // : -1/7
m = -2/63/(-1/7)
m = 2/9
m = 2/9
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