I still do not get it.  One equation that I need is 1/3P + 7 = 12 - 2/3 P.  They don't explain how to do one like that.

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So, 1/3p + 7 = 12 - 2/3p 1/3p + 7 + 2/3p = 12 - 2/3p + 2/3p p + 7 = 12 p + 7 -7 = 12 -7 p = 5   Does that sound clear, or do you need a little more help?