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42=2(10+p)
We move all terms to the left:
42-(2(10+p))=0
We add all the numbers together, and all the variables
-(2(p+10))+42=0
We calculate terms in parentheses: -(2(p+10)), so:We get rid of parentheses
2(p+10)
We multiply parentheses
2p+20
Back to the equation:
-(2p+20)
-2p-20+42=0
We add all the numbers together, and all the variables
-2p+22=0
We move all terms containing p to the left, all other terms to the right
-2p=-22
p=-22/-2
p=+11
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