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A) x - 86 = 12

x = 98

b)5y + 34 = 45

5y = 79

y = 79 / 5

c)2 + 5x = 12

5x = 10

x = 10 / 5

x = 2

d)6y + 2 = 2y

6y - 2y = - 2

4y = - 2

y = - 2 / 4

e)4x + 8 = 5x - 7

4x - 5x = - 8 - 7

x = - 15

f) 4 - 3x = - 2x - 1 - 2x - 3x = - 4 - 1 - 5x = - 5

x = - 5 / - 5

x = 1

g) 6x + 9 = 15x - 3

6x - 15x = - 9 - 3 - 9x = - 12

x = - 12 / - 9

h)3x + 7 = 17 - 6x

3x + 6x = - 7 + 17

9x = 10

x = 10 / 9.