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100-p=20+3p
We move all terms to the left:
100-p-(20+3p)=0
We add all the numbers together, and all the variables
-p-(3p+20)+100=0
We add all the numbers together, and all the variables
-1p-(3p+20)+100=0
We get rid of parentheses
-1p-3p-20+100=0
We add all the numbers together, and all the variables
-4p+80=0
We move all terms containing p to the left, all other terms to the right
-4p=-80
p=-80/-4
p=+20
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