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-9=3P+20
We move all terms to the left:
-9-(3P+20)=0
We get rid of parentheses
-3P-20-9=0
We add all the numbers together, and all the variables
-3P-29=0
We move all terms containing P to the left, all other terms to the right
-3P=29
P=29/-3
P=-9+2/3
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