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