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m in (-oo:+oo)
5*m+3/5 = 253/5 // - 253/5
5*m+3/5-(253/5) = 0
5*m+3/5-253/5 = 0
5*m-50 = 0 // + 50
5*m = 50 // : 5
m = 50/5
m = 10
m = 10
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