book Maths Puzzle Numerical Ability

I need help solving this problem. I am confused on where to begin. The problem is 3x=6x+27. How would I go about solving this. I am horrible in Math and need your help. It is greatly appreciated.

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book Other Question

half of a number and nine is 15 in substitution how do you solve for a equation for x. then solve it for y?
example 3x-5y=12