Book Maths Puzzle Algebra

what is/are condition(s) for equality of two linear equation.

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Book Other Question

25 stars 6 pair are binaries. friend and i say 48% are binaries, correct?? 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.