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m in (-oo:+oo)
(6/7)*m-(1/3) = -151/21 // + -151/21
(6/7)*m-(1/3)-(-151/21) = 0
(6/7)*m-1/3+151/21 = 0
6/7*m+48/7 = 0 // - 48/7
6/7*m = -48/7 // : 6/7
m = -48/7/6/7
m = -8
m = -8
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