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m in (-oo:+oo)
9-7*m = 5*m-39 // - 5*m-39
9-7*m-(5*m)+39 = 0
9-7*m-5*m+39 = 0
48-12*m = 0 // - 48
-12*m = -48 // : -12
m = -48/(-12)
m = 4
m = 4
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