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m in (-oo:+oo)
6*m-8 = 3*m-29 // - 3*m-29
6*m-(3*m)-8+29 = 0
6*m-3*m-8+29 = 0
3*m+21 = 0 // - 21
3*m = -21 // : 3
m = -21/3
m = -7
m = -7
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