Tìm x biết: 2x - 7 = -11

a) 2x - 7 = -11                        b) 5 + 3x = | -11 |                     c) x - ( 12 - x ) = x - 8

d) | 2x - 3 | - | 5 | = | -11 | - 3   e) | x | + | y | = 0                      f) | x - 3 | + | y + 2 | = 0

g) x.(x + 7) = 0                       h) (x + 12).(x-3) = 0                i) (-x + 5).(3 – x ) = 0

k) x.(2 + x).( 7 – x) = 0          l) (x - 1).(x +2).(-x -3) = 0