What is 2x plus 21 divided by 2 equals x plus 7?

What’s the answer ? use the picture to see the problem

Answer for 10 points show work you guys in advanced < 3

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )