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m in (-oo:+oo)
m/4 = 5/7 // - 5/7
m/4-(5/7) = 0
m/4-5/7 = 0
1/4*m-5/7 = 0 // + 5/7
1/4*m = 5/7 // : 1/4
m = 5/7/1/4
m = 20/7
m = 20/7
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