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-20=-4p-13
We move all terms to the left:
-20-(-4p-13)=0
We get rid of parentheses
4p+13-20=0
We add all the numbers together, and all the variables
4p-7=0
We move all terms containing p to the left, all other terms to the right
4p=7
p=7/4
p=1+3/4
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