exam Maths Puzzle Numerical Ability

3(x - 4) > 7x - 9 What is the solution?

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Please help to

Write -3R - 7U in polar form
I have to simplyfy the following problems. I thought I had the correct answer, but somewhere I did a mistake & can't figure out what it is.
The problems are:
1) (18/6)+[(3+5)82]