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m in (-oo:+oo)
14-(m/5) = m/2 // - m/2
14-(m/5)-(m/2) = 0
14-7/10*m = 0 // - 14
-7/10*m = -14 // : -7/10
m = -14/(-7/10)
m = 20
m = 20
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