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-400(3.5-3)+1800=p
We move all terms to the left:
-400(3.5-3)+1800-(p)=0
We add all the numbers together, and all the variables
-p+1800-400(0.5)=0
We add all the numbers together, and all the variables
-1p+1600=0
We move all terms containing p to the left, all other terms to the right
-p=-1600
p=-1600/-1
p=+1600
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