The function is f(x) = 2x + 1 and f(x) = 5 - 2x

If you want to find the value of x that makes the two functions the same, set the two functions equal to each other:     2x + 1  =  5 - 2x, then solve for x:

--->        4x + 1  =  5

--->               4x  =  4

--->                 x  =  1