Add and simplify.
(2x-y-2z-6) + (-6x+4y+3z+8)

a. -4x+3y+z+2
b. 4x-3y-z+2
c. -4x+3y-z-2
d. 4x-3y+z+2

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!