)
Which facts could be applied to simplify this expression? Check all that apply.

5 x + 3 y + (negative x) + 6 z
To add like terms, add the coefficients, not the variables.
First add 5x + x.
The simplified expression is 4 x + 3 y + 6 z.
Only combine terms which contain the same variable.
The simplified expression is 5 x + 3 y + 6 z.