I'm not sure how to do this.

simply expression by combining like terms.

8x+y-9x+3z+2x-7y+z

So first you wanna group the ones that are the same so 8x-9x+2x so that will give you 1x

Then you do y-7y then that gives you -6y

Then you do 3z+z and that gives you 4z

So the answers is 1x-6y+4z

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.