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m in (-oo:+oo)
m/5 = 1/7 // - 1/7
m/5-(1/7) = 0
m/5-1/7 = 0
1/5*m-1/7 = 0 // + 1/7
1/5*m = 1/7 // : 1/5
m = 1/7/1/5
m = 5/7
m = 5/7
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