book Maths Puzzle Numerical Ability

I have worked this several times and keep coming up with diffrent answers-the wrong answers 6[3+2(x-5)]-[2-(x+1)] What do I do with the - between the two bracets?

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book Other Question

solve for x and y
2x+yi= 3x+1+3i The second of three numbers is 8 more than the first, and the third number is 3 less than 3 times the first. If the third number is 15 more than the second, find the three numbers.