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m in (-oo:+oo)
4*m-7 = 5*m-19 // - 5*m-19
4*m-(5*m)-7+19 = 0
4*m-5*m-7+19 = 0
12-m = 0 // - 12
-m = -12 // * -1
m = 12
m = 12
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