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m in (-oo:+oo)
3.5 = m/7 // - m/7
3.5-(m/7) = 0
3.5-1/7*m = 0 // - 3.5
-1/7*m = -3.5 // : -1/7
m = -3.5/(-1/7)
m = 24.50000049
m = 24.50000049
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