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m in (-oo:+oo)
2*m-3 = 4*m+19 // - 4*m+19
2*m-(4*m)-19-3 = 0
2*m-4*m-19-3 = 0
-2*m-22 = 0 // + 22
-2*m = 22 // : -2
m = 22/(-2)
m = -11
m = -11
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