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m in (-oo:+oo)
1/42 = 3*m // - 3*m
1/42-(3*m) = 0
1/42-3*m = 0
1/42-3*m = 0 // - 1/42
-3*m = -1/42 // : -3
m = -1/42/(-3)
m = 1/126
m = 1/126
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