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m in (-oo:+oo)
2*m-(3/7) = -159/77 // + -159/77
2*m-(3/7)-(-159/77) = 0
2*m-3/7+159/77 = 0
2*m+18/11 = 0 // - 18/11
2*m = -18/11 // : 2
m = -18/11/2
m = -9/11
m = -9/11
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