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m in (-oo:+oo)
5*m-(6*m)+8 = 16 // - 16
5*m-(6*m)-16+8 = 0
5*m-6*m-16+8 = 0
-m-8 = 0 // + 8
-m = 8 // * -1
m = -8
m = -8
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