the first step is to identify like terms and unlike terms.7=-12+e
7+12=e
e=19
{r+4}+2=1,r+4+2=1
r+6=1
r=1-6,r=-5
-2+{1+p}=5
-2+1+p=5,-1+p=5
p=5+1
p=6
b-6+14=100
b+8=100-8
b=92
1=-2-{4-w}in this question you will use the negative sign to open brackets.
2-4+w,1=2-4+w
1=-2+w
1+2=w
3=w
