exam Maths Puzzle Numerical Ability

four less than seven times a number

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exam Other Question

I am suppose to add and express in the simplest form.

x-13/x^2-x-12 + 3x-3/x^2-x-12

Could you tell me if I have this correct I got: 4 / x - 4

Is this correct? Thank you for your help. I need help working this problem.
1. A combined total of $20,000 is invested in two bonds that pay 8% and 9.5% simple interest. The annual interest is $1675. How much is invested in each bond?