book Maths Puzzle Numerical Ability

Can you answer the following and show the working out?

6/ (c - 3) - 2 (c - 4)^-1 = 0

Thanks

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book Other Question

Calculate the sum of all even positive integers from 2 to 4000. Solve the following for "x" by using the quadratic formula:

2x^2 + 8x + 3 = 0