Case I. when x>0
x=5x-16
x=4
Case II when x<0
-x=5x-16
x=8/3 but x should be less than 0, so not possible.
x=4 only solution and sum is 4.
x=5x-16
x=4
Case II when x<0
-x=5x-16
x=8/3 but x should be less than 0, so not possible.
x=4 only solution and sum is 4.
