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m in (-oo:+oo)
3-5*m = 5*m-27 // - 5*m-27
3-5*m-(5*m)+27 = 0
3-5*m-5*m+27 = 0
30-10*m = 0 // - 30
-10*m = -30 // : -10
m = -30/(-10)
m = 3
m = 3
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