2. -6a+3=-3(2a-1)

a) a=5
b) a=10
c) no solution
d) identity

3. 0.5b+4=2(b+2)

a) b=0
b) b=0.5
c) no solution
d) identity

4. 8-(3+b)=b-9

a) 7
b) 8
c) no solution
d) identity