1) |x|=7
x1= 7
x2= -7
2) |6+x|=9
6+x=9
x1=3
6+x=-9
x2= -15
3) |4x-3|=9
4x-3=9
4x=12
x1=3
4x-3= -9
4x= -6
x2= -3/2
4) |1/3+x|-2/9=5/12
|1/3+x|=5/12+2/9=15+8/36= 23/36
1/3+x=23/36
x1= 23/36-12/36
x1=11/36
1/3+x= -23/36
x2= -23/36-12/36
x2= -35/36
5) 2/7+|0,2-t|=1/7
0,2-t= -1/7
t= 1/5+1/7
t1= 12/35
0,2-t=1/7
t=1/5-1/7
t2= 2/35