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m in (-oo:+oo)
2*m+2/5 = 72/5 // - 72/5
2*m+2/5-(72/5) = 0
2*m+2/5-72/5 = 0
2*m-14 = 0 // + 14
2*m = 14 // : 2
m = 14/2
m = 7
m = 7
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