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3.5p+6(7.5)=55.5
We move all terms to the left:
3.5p+6(7.5)-(55.5)=0
We add all the numbers together, and all the variables
3.5p-10.5=0
We move all terms containing p to the left, all other terms to the right
3.5p=10.5
p=10.5/3.5
p=3
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