Even though it make sense than 0 ≥ -7... But since 'n' disappeared, this means that this equation have no solution. To solve means to find the value of 'n' and if there is no 'n' since 3n-3n=0, there is no solutions.
This question is pretty much invalid.
Extra: To tackle such inequality qns: Step 1: Expand the brackets Step 2: Move the term to one side of the equations and constant to another side of the equation. Step 3: Find the value of the term. Done.