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129.8=p+41.8
We move all terms to the left:
129.8-(p+41.8)=0
We get rid of parentheses
-p-41.8+129.8=0
We add all the numbers together, and all the variables
-1p+88=0
We move all terms containing p to the left, all other terms to the right
-p=-88
p=-88/-1
p=+88
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