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p+68=2(p+21)
We move all terms to the left:
p+68-(2(p+21))=0
We calculate terms in parentheses: -(2(p+21)), so:We get rid of parentheses
2(p+21)
We multiply parentheses
2p+42
Back to the equation:
-(2p+42)
p-2p-42+68=0
We add all the numbers together, and all the variables
-1p+26=0
We move all terms containing p to the left, all other terms to the right
-p=-26
p=-26/-1
p=+26
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