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3p+21-4p+1=-10p+15+1
We move all terms to the left:
3p+21-4p+1-(-10p+15+1)=0
We add all the numbers together, and all the variables
3p-4p-(-10p+16)+21+1=0
We add all the numbers together, and all the variables
-1p-(-10p+16)+22=0
We get rid of parentheses
-1p+10p-16+22=0
We add all the numbers together, and all the variables
9p+6=0
We move all terms containing p to the left, all other terms to the right
9p=-6
p=-6/9
p=-2/3
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