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m in (-oo:+oo)
-46 = 5*m-m+2 // - 5*m-m+2
m-(5*m)-46-2 = 0
m-5*m-46-2 = 0
-4*m-48 = 0 // + 48
-4*m = 48 // : -4
m = 48/(-4)
m = -12
m = -12
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