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m in (-oo:+oo)
(5/7)*m+4 = 32/7 // - 32/7
(5/7)*m-(32/7)+4 = 0
(5/7)*m-32/7+4 = 0
5/7*m-4/7 = 0 // + 4/7
5/7*m = 4/7 // : 5/7
m = 4/7/5/7
m = 4/5
m = 4/5
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