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m in (-oo:+oo)
2*m+6 = 7*m-34 // - 7*m-34
2*m-(7*m)+6+34 = 0
2*m-7*m+6+34 = 0
40-5*m = 0 // - 40
-5*m = -40 // : -5
m = -40/(-5)
m = 8
m = 8
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