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m in (-oo:+oo)
3-6*m-(2*m) = -61 // + 61
3-6*m-(2*m)+61 = 0
3-6*m-2*m+61 = 0
64-8*m = 0 // - 64
-8*m = -64 // : -8
m = -64/(-8)
m = 8
m = 8
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