book Maths Puzzle Numerical Ability

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

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book Other Question

Can someone out there help me with this problem?

How do you find the least common multiple (LCM) for the following group of numbers.
12, 20, and 35. Explain if you can how you come up with your answer.
Thanks!
x+16=5x+10