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5p-13=3p-21+4p-5p
We move all terms to the left:
5p-13-(3p-21+4p-5p)=0
We add all the numbers together, and all the variables
5p-(2p-21)-13=0
We get rid of parentheses
5p-2p+21-13=0
We add all the numbers together, and all the variables
3p+8=0
We move all terms containing p to the left, all other terms to the right
3p=-8
p=-8/3
p=-2+2/3
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