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39)

a. 3x + 20 = 7

3x = 20 - 7

3x = 13

x = 13/3

b. 2 (L + 5) = 3

2L + 10  = 3

2L = 3 - 10

2L = - 7

L = - 7/2 = - 3,5

c. 2 - 4y = 1

- 4y = 1 - 2

- 4y = - 1

y = 1/4

40)

a. 3 - 5x = 2

- 5x = 2 - 3

- 5x = - 1

x = 1/5

b. (t - 5) / 3 = 7

t - 5 = 21

t = 21 + 5

t = 26

c. m/2 - 3 = 6

m - 6 = 12

m = 12 + 6

m = 18.

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