Question

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Answer 1

a) 16 + 8m = 81 + 3m

8m - 3m = 81 - 16

5m = 65 / 5

M = 13


b) 12x = 5x + 49

12x - 5x = 49

7x = 49 / 7

x = 7


c) 20 - 8z = -19 - 21z

-8z + 21z = -19 - 20

13z = -39 / 13

Z = -3


d) 5a - 6 = 2( a + 9)

5a - 6 = 2a + 18

5a - 2a = 18 + 6

3a = 24 / 3

a = 8

Answer 2

a) 16 + 8m = 81 + 3m

8m - 3m = 81 - 16

5m = 65

m = 65/5  → m = 13

b) 12x = 5x + 49

12x - 5x = 49

7x = 49

x = 49/7  →  x = 7

c) 20 - 8z = - 19 - 21z

- 8z + 21z = - 19 - 20

13z = - 39

z = - 39/13  → z =  - 3

d) 5a - 6 = 2( a + 9 )

5a - 6 = 2a + 18

5a - 2a = 18 + 6

3a = 24

a = 24/3  →  a = 8