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3p+-18=105+180

We move all terms to the left:

3p+-18-(105+180)=0

We add all the numbers together, and all the variables

3p-18+-285=0

We add all the numbers together, and all the variables

3p-303=0

We move all terms containing p to the left, all other terms to the right

3p=303

p=303/3

p=101

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