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+3=4P-9
We move all terms to the left:
+3-(4P-9)=0
We get rid of parentheses
-4P+9+3=0
We add all the numbers together, and all the variables
-4P+12=0
We move all terms containing P to the left, all other terms to the right
-4P=-12
P=-12/-4
P=+3
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