Book Maths Puzzle Algebra

Let p1 and p2 be two odd primes. Show that there is a prime q such that q is not in {p1,p2} and q divides the sum p1 + p2.

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what is/are condition(s) for equality of two linear equation. Hello, I'm finding the following question a little difficult:
Q. Find x
4^x + 2^(x+1) = 16

Thank you very much for your time and help,
Jenesse Ubhi