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2a=12-6
2a=6
a=6:2
a=3
b.10r-15=5
10r=5+15
10r=20
r=2
c. 3p+18=2p-6
3p-2p=-6-18
p=-24
d.12-6x==12
-6x=0
x=0
e. 20-8x=12
20-8x=12
-8x=-8
x=1
2a+6=12
2a=12-6=6
a=6/2=3
B.5(2r-3)=5
10r-15=5
10r=5+15
10r=20
r=2
C. 3(p+6)=2(p-3)
3p+9=2p-6
3p-2p=-6-9
p= -15
D.6(2-x)=12
12-6x=12
6x= 12-12
x= 0/6
E. 4(5-2x)=12
20-8x=12
8x= 12-20
8x= -8
x= -1