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m in (-oo:+oo)
(3/5)*m = -8/7 // + -8/7
(3/5)*m-(-8/7) = 0
(3/5)*m+8/7 = 0
3/5*m+8/7 = 0 // - 8/7
3/5*m = -8/7 // : 3/5
m = -8/7/3/5
m = -40/21
m = -40/21
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