If you follow PEMDAS
P-parentheses
E-exponent
M-multiplication
D-divide
a-addition
s-subtraction
then you should look in the parentheses and multiplying 3x should be your first step IF you know x
hope this helps :)
= -10x^2 - 6xy + 6xz
hope it helps
Im pretty sure tge answers -1.68426