book Maths Puzzle Numerical Ability

How to solve this equation?

4(n+3)=2(6+2n)

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book Other Question

i think is that 1write the fraction in simplest form Quadratic equations:

Find two possitive numbers that differ by 2 and have a producy of 20.

The answer is -1 + squareroot of 21 and 1 + squareroot of 21.

How do I at the answer. (need steps)