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21p/3+79=135
We move all terms to the left:
21p/3+79-(135)=0
We add all the numbers together, and all the variables
21p/3-56=0
We multiply all the terms by the denominator
21p-56*3=0
We add all the numbers together, and all the variables
21p-168=0
We move all terms containing p to the left, all other terms to the right
21p=168
p=168/21
p=8
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