book Maths Puzzle Numerical Ability

solve for x and y
2x+yi= 3x+1+3i

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book Other Question

the longest side of a right triangle is 15 cm. Another side measures 12 cm. What is the length of the third side? 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?