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7p+9=40.5
We move all terms to the left:
7p+9-(40.5)=0
We add all the numbers together, and all the variables
7p-31.5=0
We move all terms containing p to the left, all other terms to the right
7p=31.5
p=31.5/7
p=4+2.3333333333333/4.6666666666667
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