Please help me understand this Math Problem if You can

This math problem falls under the category of solving a two-step Equation with Signed Fractions.

The LCD I got for 5,4, and 3 was 15 and the final answer that got me was -1/4. But in the resolved problem they got 60 as the LCD What am I missing or what did I do wrong? Can someone please explain, thank you for your help and time.

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fakable Best Comment

LCD = 60

1/5=12/60
7/4=105/60
2/3=40/60

MightyLion · 22-25, M

@fakable I figured it out, I think I was looking for LCD instead of LCM (least common multiple), thank you for trying to help me.