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m in (-oo:+oo)
m/7 = 9/5 // - 9/5
m/7-(9/5) = 0
m/7-9/5 = 0
1/7*m-9/5 = 0 // + 9/5
1/7*m = 9/5 // : 1/7
m = 9/5/1/7
m = 63/5
m = 63/5
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