exam Maths Puzzle Numerical Ability

How do you find out what "x" is in this equation: 15-(x-6)=6-(3x+5)

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exam Other Question

The length of a retangle is twice the width. The area is 392 yards^2. Find the length and width.

I tried to solve this problem, but I am not sure if I did it correctly.

A=196(95)-(95)
=18620 - 9025
=9595

w=95
l=95
A total of $10,000 is invested in two funds paying 5% and 7% annual interest. The combined annual interest is $644. How much of the $10,000 is invested in each fund?