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m in (-oo:+oo)
2*m+8 = 3*m+5 // - 3*m+5
2*m-(3*m)-5+8 = 0
2*m-3*m-5+8 = 0
3-m = 0 // - 3
-m = -3 // * -1
m = 3
m = 3
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