x+2x=3x

8a+9a=17a

11b+9b=20b

–b–5b=–6b

–9m–7m=–16m

–8m–m=–9m

4

a

x

+5

a

x

=9

a

x

6a


x+1


+8a


x+1


=14a


x+1

–m


x+1


–5m


x+1


=–6m


x+1

–3a


x–2


–a


x–2


=–4a


x–2

1

2

a+

1

2

a=


a+a


2

=


2a


2

=a

3

5

ab+

1

10

ab=


6ab+ab


10

=


7ab


10

1

3

xy+

1

6

xy=


2xy+xy


6

=


3xy


6

=


xy


2

–

1

5

xy–

4

5

xy=


–xy–4xy


5

=–


5xy


5

=–xy

–

5

6



a

2

b–

1

8



a

2

b=


–20

a

2

b–3

a

2

b


24

=–


23

a

2

b


24

–a–

7

8

a=


–8a–7a


8

=–


15a


8

8a+9a+6a+=23a

15x+20x+x=36x

–7m–8m–9m=–24m

–

a

2

b–

a

2

b–3

a

2

b=–5–

a

2

b

a

x

+3

a

x

+8

a

x

=12

a

x

–5

a


x+1


–3

a


x+1


–5

a


x+1


=–13

a


x+1

a+

1

2

a+

2

3

a=


6a+3a+4a


6

=


13a


6

–x–

2

3

x–

1

6

x=


–6x–4x–x


6

=–


11x


6

1

5

ax+

3

10

ax+ax=


2ax+3ax+10ax


10

=


15ax


10

=


3ax


2

–

3

4



a

2

x–

5

6



a

2

x–

a

2

x=


–9

a

2

x–10

a

2

x–12

a

2

x


12

=–


31

a

2

x


12

11a+8a+9a+11a=39a

m


x+1


+3m


x+1


+4m


x+1


+6m


x+1


=14m


x+1

–x

2

y–8x

2

y–9x

2

y–20x

2

y=–38x

2

y

–3a

m

–5a

m

–6a

m

–9a

m

=–23a

m

1

2

a+

1

4

a+

1

8

a+a=


4a+2a+a+8a


8

=


15a


8

2

5

ax+

1

2

ax+

1

10

ax+

1

20

ax=


8ax+10ax+2ax+ax


20

=


21ax


20

0.5m+0.6m+0.7m+0.8m=2.6m

–

1

7

ab–

1

14

ab–

1

28

ab–ab=


–4ab–2ab–ab–28ab


28

=–


35ab


28

=–


5ab


4

–

2

3



x

3

y–

1

6



x

3

y–

1

9



x

3

y–

1

12



x

3

y=


–24

x

3

y–6

x

3

y–4

x

3

y–3

x

3

y


36

=–


37

x

3

y


36

ab

2

+ab

2

+7ab

2

+9ab

2

+21ab

2

=39ab

2

–m–m–8m–7m–3m=–20m

–x


a+1


–8x


a+1


–4x


a+1


–5x


a+1


–x


a+1


=–19x


a+1

1

2

a+

1

3

a+

1

4

a+

1

5

a+

1

6

a=


30a+20a+15a+12a+10a


60

=

87

60

a=

29

20

a

–

1

3

ab–

1

6

ab–

1

2

ab–

1

12

ab–

1

9

ab=


–12ab–6ab–18ab–3ab–4ab


36

=–

43

36

ab