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5p-15+p+5+p+7=180
We move all terms to the left:
5p-15+p+5+p+7-(180)=0
We add all the numbers together, and all the variables
7p-183=0
We move all terms containing p to the left, all other terms to the right
7p=183
p=183/7
p=26+1/7
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