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m in (-oo:+oo)
m-(5*m)+3 = 39 // - 39
m-(5*m)-39+3 = 0
m-5*m-39+3 = 0
-4*m-36 = 0 // + 36
-4*m = 36 // : -4
m = 36/(-4)
m = -9
m = -9
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