book Maths Puzzle Numerical Ability

in substitution how do you solve for a equation for x. then solve it for y?
example 3x-5y=12

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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. 1. A baseball coach is determining the batting team for the team. The team has 9 players, but the coach does not want the picher to be one of the first four to bat. How many battin