Respuesta :

tarhunbalthazar

The solution is -27 because to get z alone you need to subtract 9 from both sides, in which you get z = -27.

CharlieBrown2002

Answer: z=-27 *The answer must have negative sign.*

Explanation:

subtraction property of equality is subtracting the same number from both sides of an equation does not change the equation.

a-c=b-c

addition property of equality is adding the same number to both sides of an equation does not change the equation.

a+c=b=c

first, subtract by 9 both sides of an equation.

z+9-9=-18-9

then, simplify by equation.

18+9=27

It change positive to negative sign.

z=-27

Hope this helps!

Thanks!

Have a great day!

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