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m in (-oo:+oo)
2*m+5 = 6*m+21 // - 6*m+21
2*m-(6*m)-21+5 = 0
2*m-6*m-21+5 = 0
-4*m-16 = 0 // + 16
-4*m = 16 // : -4
m = 16/(-4)
m = -4
m = -4
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