[tex]\huge{\boxed{14x^3 + 7y^2 - 2}}[/tex]
The like terms can be grouped by their variables and exponents. Let's do that.
[tex]x^3:\ \ \ 4x^3 + 6x^3 - 4x^3[/tex]
[tex]y^2:\ \ \ 7y^2[/tex]
[tex]1^1:\ \ \ \ -1 - 6 + 5[/tex]
Now, just add each group of like terms together by adding their coefficients.
[tex]x^3:\ \ \ 4x^3 + 6x^3 - 4x^3\ \ \ \bf{=14x^3}[/tex]
[tex]y^2:\ \ \ 7y^2\ \ \ \bf{=7y^2}[/tex]
[tex]1^1:\ \ \ \ -1 - 6 + 5\ \ \ \bf{=-2}[/tex]
Now, add all the terms together. [tex]\boxed{14x^3 + 7y^2 - 2}[/tex]
