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3xy^4+y-2/x

Step-by-step explanation:

12x^3y^4 + 4x^2y -8x

4x^2

We can break this fraction into pieces

12x^3y^4      4x^2y        8x

+       -  

4x^2                4x^2          4x^2

Taking the first piece

12/4 =3

x^3/x^2 =x

y^4/1 =y^4

3xy^4

Taking the second fractions

4/4=1

x^2/x^2 =1

y=y

y

Taking the third fraction

8/4=2

x/x^2 = 1/x

2/x

Adding them back together

3xy^4+y-2/x