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m in (-oo:+oo)
3-(7*m) = 2*m-51 // - 2*m-51
3-(7*m)-(2*m)+51 = 0
3-7*m-2*m+51 = 0
54-9*m = 0 // - 54
-9*m = -54 // : -9
m = -54/(-9)
m = 6
m = 6
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