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m in (-oo:+oo)
7*(7-3*m) = 301 // - 301
7*(7-3*m)-301 = 0
7*(7-3*m)-301 = 0
-21*m-252 = 0
-21*m-252 = 0
-21*m-252 = 0 // + 252
-21*m = 252 // : -21
m = 252/(-21)
m = -12
m = -12
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