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2.- a*4/a*2=a*2
3.- (-12x*5)/(-12x*4)=x
4.- (-14y*4)/(-2y*2)=7y*2
5.- 20m*4/5m*3=4m
6.- (-20z*5)/4z*4=-5z
8x³:2x= 4x²
a⁴: a²= a²
(-12x⁵) : (-12x⁴)= 1x¹ = x
(-14y⁴) : (-2y²)= 7y²
20m⁴:5m³= 4m¹
(-20z⁵): 4z⁴= -5z¹