First, let's distribute the coefficients:

4.5у + 9 - 3.1 + 3.1у > 5.9 + 7.2у

Combine like terms:

7.6y + 5.9 > 5.9 + 7.2у

Subtract 5.9 from both sides:

7.6y > 7.2у

Subtract 7.2y from both sides:

0.4y > 0

Divide by 0.4 on both sides:

y > 0

Therefore, the solution to the inequality is y > 0.