Here is the solution for each:

1. 3w+6=4w

4w-3w=6

w=6 is the answer

2. a+18=7a

7a-a=18

6a=18

a=18/6=3 is the answer

3. 8c=5c+21

8c-5c=21

3c=21

c=21/3=7 is the answer

4. 11d+10=6d

11d-6d=10

5d=10

d=10/5=2 is the answer

5. 2e=4e-16

4e-2e=16

2e=16

e=16/2

e=8 is the answer

6. 7v=2v-20

7v-2v=-20

5v=-20

v=-20/5= -4 is the answer

7. 4n-6=10n

10n-4n=-6

6n=-6

n=-1 is the answer

8. 2y+27=5y

5y-2y=27

3y=27

y=27/3

y=9 is the answer

9. 8h=6h-14

8h-6h=-14

2h=-14

h=-7 is the answer

10. 18-2g=4g

4g+2g=18

6g=18

g=18/6

g=3 is the answer

1. 3w+6=4w

4w-3w=6

w=6 is the answer

2. a+18=7a

7a-a=18

6a=18

a=18/6=3 is the answer

3. 8c=5c+21

8c-5c=21

3c=21

c=21/3=7 is the answer

4. 11d+10=6d

11d-6d=10

5d=10

d=10/5=2 is the answer

5. 2e=4e-16

4e-2e=16

2e=16

e=16/2

e=8 is the answer

6. 7v=2v-20

7v-2v=-20

5v=-20

v=-20/5= -4 is the answer

7. 4n-6=10n

10n-4n=-6

6n=-6

n=-1 is the answer

8. 2y+27=5y

5y-2y=27

3y=27

y=27/3

y=9 is the answer

9. 8h=6h-14

8h-6h=-14

2h=-14

h=-7 is the answer

10. 18-2g=4g

4g+2g=18

6g=18

g=18/6

g=3 is the answer