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m in (-oo:+oo)
-3 = 4*m-m+3 // - 4*m-m+3
m-(4*m)-3-3 = 0
m-4*m-3-3 = 0
-3*m-6 = 0 // + 6
-3*m = 6 // : -3
m = 6/(-3)
m = -2
m = -2
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