Tentukan nilai x yang memenuhi persamaan |x+1|+2|1-x|-|2x-8|=10

( x + 1 ) + 2 ( 1 - x ) - ( 2x - 8 ) = 10
x + 1 + 2 - 2x - 2x + 8 = 10
11 - 3x = 10
3x = 10 + 11
3x = 21
× = 21/3
x = 7