book Maths Puzzle Numerical Ability

Christy spent $500 over her budget on gifts during the holidays. In addition to her regular job, she took a part time job at the Pharamacy that paid $10 per hour. Her schdule would

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(1/x) - [1/(x+4)]=1/3
i know i need to multiply by 3x(x+4) but i dont know what to do after that
Factor completely with respect to the integers. 2x3-3x2+8x