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m in (-oo:+oo)
3*(1-3*m) = 48 // - 48
3*(1-3*m)-48 = 0
3*(1-3*m)-48 = 0
-9*m-45 = 0
-9*m-45 = 0
-9*m-45 = 0 // + 45
-9*m = 45 // : -9
m = 45/(-9)
m = -5
m = -5
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