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+19=3P-91
We move all terms to the left:
+19-(3P-91)=0
We get rid of parentheses
-3P+91+19=0
We add all the numbers together, and all the variables
-3P+110=0
We move all terms containing P to the left, all other terms to the right
-3P=-110
P=-110/-3
P=36+2/3
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