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m in (-oo:+oo)
4*m-(5*m)+1 = 12 // - 12
4*m-(5*m)-12+1 = 0
4*m-5*m-12+1 = 0
-m-11 = 0 // + 11
-m = 11 // * -1
m = -11
m = -11
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