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m in (-oo:+oo)
6-(2*m)-m = 39 // - 39
6-(2*m)-m-39 = 0
6-2*m-m-39 = 0
-3*m-33 = 0 // + 33
-3*m = 33 // : -3
m = 33/(-3)
m = -11
m = -11
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