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8+2(p+1)=21
We move all terms to the left:
8+2(p+1)-(21)=0
We add all the numbers together, and all the variables
2(p+1)-13=0
We multiply parentheses
2p+2-13=0
We add all the numbers together, and all the variables
2p-11=0
We move all terms containing p to the left, all other terms to the right
2p=11
p=11/2
p=5+1/2
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