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43)

a. 5x + 7 = 2x - 2

5x - 2x = - 2 - 7

3x = - 9

x = - 9/3

x = - 3

b. 3x + 2 = x - 10

3x - x = - 10 - 2

2x = - 12

x =  - 12/2

x = - 6

44)

a. 2x - 5 = 5x + 1

2x - 5x = 1 + 5

- 3x = 6

x = - 6/3

x = - 2

b.

3 - 7x = 3x + 2

- 7x - 3x = 2 - 3

- 10x = - 1

x = 1/10

45)

a. 5x - 6 = - x + 3

5x + x = 3 + 6

6x = 9

x = 9/6

x = 3/2

b. 2x - 1/3 = 1

2x = 1 + 1/3

6x = 3 + 1

6x = 4

x = 4/6

x = 2/3.