Answer:
a = 12
Step-by-step explanation:
Expand the brackets
6a - 18 + 2 = 3a + 20
Rearrange and make like terms on either side
6a - 3a = 20 + 18 - 2
3a = 36
Divide both sides by 3 to make variable on its own
3/3 a = 36/3
Answer: a = 12
