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+21=6P-4
We move all terms to the left:
+21-(6P-4)=0
We get rid of parentheses
-6P+4+21=0
We add all the numbers together, and all the variables
-6P+25=0
We move all terms containing P to the left, all other terms to the right
-6P=-25
P=-25/-6
P=4+1/6
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