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4=100-8p
We move all terms to the left:
4-(100-8p)=0
We add all the numbers together, and all the variables
-(-8p+100)+4=0
We get rid of parentheses
8p-100+4=0
We add all the numbers together, and all the variables
8p-96=0
We move all terms containing p to the left, all other terms to the right
8p=96
p=96/8
p=12
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