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m in (-oo:+oo)
8/24 = m/84 // - m/84
8/24-(m/84) = 0
1/3-1/84*m = 0 // - 1/3
-1/84*m = -1/3 // : -1/84
m = -1/3/(-1/84)
m = 28
m = 28
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