27 5/9-18 7/9=
5(8-y)=-(y-4)
|0.2x+0.6|<0.15
6(b-2)=5(9+b)
|x+3|<1
sn9 =66°
|2x+5|<0.5
3(4x-7)=10(x+5)
5(2x+4)=8(x-3)