Algebra Demystified 2nd Ed

Chapter 7 linear equaTionS 193

6.^1
2

683242 1

343684

6284

()xx()()x

xxx

xx

−+ += −

−+ += −

+= −

− 666

22 4

44

62

6

2

2

2

3

xx

x

x

x

x

−

=−

++

=

=

=

7. 576242 3

576128 12

572

2

xx x

xxx

xx

x

+= −− −

+= −−+

+=−

+ +

()()

22

770

77

77

7

7

7

7

1

x

x

x

x

x

+=

−=−

=−

=−

=−

8. 32 5241532

6158 2515 2

2

()xx()()x

xxx

x

−− +=−+−

−−−=−−−

− −−=−−

++

−=−

++

=

=

=

17 517

55

31717

17 17

30

3

3

0

3

0

x

xx

x

x

x

x