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m in (-oo:+oo)
3*m+2 = 5*m-6 // - 5*m-6
3*m-(5*m)+2+6 = 0
3*m-5*m+2+6 = 0
8-2*m = 0 // - 8
-2*m = -8 // : -2
m = -8/(-2)
m = 4
m = 4
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