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m in (-oo:+oo)
3*m-(6*m)+8 = -25 // + 25
3*m-(6*m)+8+25 = 0
3*m-6*m+8+25 = 0
33-3*m = 0 // - 33
-3*m = -33 // : -3
m = -33/(-3)
m = 11
m = 11
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