To solve for z, let's first use the distributive property on the right side of the equation to make it:

Now, add 2z to both sides to get rid of it on one of the sides:

In the same manner, add 14 to both sides:

Now divide by 7 (you only need to switch the sign if dividing by a negative number - so not in this case):


Therefore, your answer is: z < -2. Hope I could help you out!