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m in (-oo:+oo)
(2/7)*m = -4/5 // + -4/5
(2/7)*m-(-4/5) = 0
(2/7)*m+4/5 = 0
2/7*m+4/5 = 0 // - 4/5
2/7*m = -4/5 // : 2/7
m = -4/5/2/7
m = -14/5
m = -14/5
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