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90=10(p-20)
We move all terms to the left:
90-(10(p-20))=0
We calculate terms in parentheses: -(10(p-20)), so:We get rid of parentheses
10(p-20)
We multiply parentheses
10p-200
Back to the equation:
-(10p-200)
-10p+200+90=0
We add all the numbers together, and all the variables
-10p+290=0
We move all terms containing p to the left, all other terms to the right
-10p=-290
p=-290/-10
p=+29
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