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2+21=10P-4
We move all terms to the left:
2+21-(10P-4)=0
We add all the numbers together, and all the variables
-(10P-4)+23=0
We get rid of parentheses
-10P+4+23=0
We add all the numbers together, and all the variables
-10P+27=0
We move all terms containing P to the left, all other terms to the right
-10P=-27
P=-27/-10
P=2+7/10
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