book Maths Puzzle Numerical Ability

one number is 12 more than another. the sum of the smaller number and twice the larger number is 39. find the larger number

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book Other Question
I need help factoring the following problem

3x^2 + 2x - 16

thanks - 3x - 5y + z = 2; 2x - z = 3; x + 2y + z = 8.