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m in (-oo:+oo)
2*m+7 = 6*m-29 // - 6*m-29
2*m-(6*m)+7+29 = 0
2*m-6*m+7+29 = 0
36-4*m = 0 // - 36
-4*m = -36 // : -4
m = -36/(-4)
m = 9
m = 9
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