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m in (-oo:+oo)
5*m+3/4 = 121/28 // - 121/28
5*m+3/4-(121/28) = 0
5*m+3/4-121/28 = 0
5*m-25/7 = 0 // + 25/7
5*m = 25/7 // : 5
m = 25/7/5
m = 5/7
m = 5/7
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