Jim is building a rectangular deck and wants the length to be 4 ft greater than the width. What will be the dimensions of the deck if the perimeter is to be 56 ft?

Hmm confusing don't understand

You move the constant to the right side and change its sign to be 9z= -6 -8. that’s the first step.the second step would be calculate the difference of -8-6 to get -14. you equation should now be 9z=-14the last step is to divide both sides by 9 to get z=-14/9hope this