Answer:
4x^2 + 7y^3 + 6xy
Step-by-step explanation:
2x^2+2y^3-6xy + 2x^2+5y^3+12xy
2x^2 + 2x^2 = 4x^2
2y^3 + 5y^3 = 7y^3
-6xy + 12xy = 6xy
