We are given:

Let's simplify this equation by using the distributive property. On the left, multiply everything in the parenthesis by 3. On the right, multiply everything in the parenthesis by -1. We are then left with:

On the right, we have like terms. Combine like terms.

Let's move the -18 on the left side to the right side.

Let's move the +3a on the right side to the left side. When we do that, 3a cancels out. So we are left with:

Since this statement is not true, the answer would be:
No solution