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m in (-oo:+oo)
39 = 5*m-2*m+3 // - 5*m-2*m+3
39-(-2*m)-(5*m)-3 = 0
2*m-5*m-3+39 = 0
36-3*m = 0 // - 36
-3*m = -36 // : -3
m = -36/(-3)
m = 12
m = 12
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