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m in (-oo:+oo)
4*m-(6*m)+5 = -19 // + 19
4*m-(6*m)+5+19 = 0
4*m-6*m+5+19 = 0
24-2*m = 0 // - 24
-2*m = -24 // : -2
m = -24/(-2)
m = 12
m = 12
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