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m in (-oo:+oo)
7*m+5 = 2*m+65 // - 2*m+65
7*m-(2*m)-65+5 = 0
7*m-2*m-65+5 = 0
5*m-60 = 0 // + 60
5*m = 60 // : 5
m = 60/5
m = 12
m = 12
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