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m in (-oo:+oo)
(-2/7)*m+(1/3)*m+6 = 459/77 // - 459/77
(-2/7)*m+(1/3)*m-(459/77)+6 = 0
(-2/7)*m+(1/3)*m-459/77+6 = 0
1/21*m+3/77 = 0 // - 3/77
1/21*m = -3/77 // : 1/21
m = -3/77/1/21
m = -9/11
m = -9/11
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