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m in (-oo:+oo)
1/7-(m/9) = 4/63 // - 4/63
1/7-(m/9)-(4/63) = 0
1/7-(m/9)-4/63 = 0
5/63-1/9*m = 0 // - 5/63
-1/9*m = -5/63 // : -1/9
m = -5/63/(-1/9)
m = 5/7
m = 5/7
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