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85=-p+3(3p+7)
We move all terms to the left:
85-(-p+3(3p+7))=0
We calculate terms in parentheses: -(-p+3(3p+7)), so:We get rid of parentheses
-p+3(3p+7)
We add all the numbers together, and all the variables
-1p+3(3p+7)
We multiply parentheses
-1p+9p+21
We add all the numbers together, and all the variables
8p+21
Back to the equation:
-(8p+21)
-8p-21+85=0
We add all the numbers together, and all the variables
-8p+64=0
We move all terms containing p to the left, all other terms to the right
-8p=-64
p=-64/-8
p=+8
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