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m in (-oo:+oo)
3*m+2*m-(1/2) = 69/2 // - 69/2
3*m+2*m-(1/2)-(69/2) = 0
3*m+2*m-1/2-69/2 = 0
5*m-35 = 0 // + 35
5*m = 35 // : 5
m = 35/5
m = 7
m = 7
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