Solve $\displaystyle 2^x=14-2x$ simultaneously.
this is not really simultaneous equation problem. you need more than one equation for that.
note that on the right, if you make x too big (bigger than 7), you get a negative answer. the left side is always positive, so you want to try x values that are less than 7. there is one positive solution (meaning you would try integer values for x). trial and error can find it