20.
B)2x +31=91=> 2x=60=>x=30
C)327-3x=15+48
327-3x=63/-63
3x= 264=>x=88
D)15+(x+2)+21=47/-21
15+(x+2)=26/-15
x+2=11=>x=9
E)2x+37=79-14
2x+37=65/-37
2x=28=>x=14
F)32+(2x-5)=63+14
32+(2x-5)=77/-32
2x-5=45/+5
2x=50=>x=25
21.
1453-x=783/-783
x=670
SPER CA TE AM AJUTAT :))
