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m³ = 4m
m³ - 4m = 0
m(m² - 4) = 0
m(m + 2)(m - 2) = 0
m = 0 v m = -2 v m = 2
m = {-2; 0; 2}
3m^3-12m=0
3m(m^2-4)=0
m=0 lub m^2=4
m=0 lub m=-2 lub m=2