Simplify: (-4 + x^2 +2x^3)-(-6 - x + 3x^3)-(-6y^3 + y^2)?

(-4 + x^2 + 2x^3) - (-6 - x + 3x^3) - (-6y^3 + y^2)
= -4 + x^2 + 2x^3 + 6 + x - 3x^3 + 6y^3 - y^2
= 2x^3 - 3x^3 + x^2 + x + 6y^3 - y^2 - 4 + 6
= -x^3 + x^2 + x + 6y^3 - y^2 + 2

= (- 4 + x² + 2x³) - (- 6 - x + 3x³) - (- 6y³ + y²)
= - 4 + x² + 2x³ + 6 + x - 3x³ + 6y³ - y²
= 2 + x² - x³ + x + 6y³ - y²
= 2 + x(x - x² + 1) + y²(6y - 1)

Answer: x(x - x² + 1) + y²(6x - 1) + 2

(-4 + x^2 + 2x^3) - (-6 - x + 3x^3) - (6y^3 + y^2)
-4 + x^2 + 2x^3 + 6 + x - 3x^3 - 6y^3 -y^2
-x^3 + x^2 + x + 2 - 6y^3 - y^2.

2x³ + x²________-4
-3x³_____x_____ 6

-x³ + x² + x + 2 + 6y³ - y²

(2x^3 + x^2 - 4) - (3x^3 - x - 6) - (-6y^3 + y^2)
= (x^3 + x^2 - x + 2) - y^2(-6y+1)
I guess that's it
That's all I can give...