Tìm x, biết: |2x - 6| + |x + 3| = 8; |x + 1| + |x - 2| + |x + 3| = 6

Tìm x,biết:
1) |2x-6|+|x+3|=8
2) |x+1| +|x-2|+|x+3| =6
3) |x-2|+|x-3|+|x-4|=2
4) 2.|x+2|+|4-x|=11