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1000=800(1+r/100)
We move all terms to the left:
1000-(800(1+r/100))=0
We add all the numbers together, and all the variables
-(800(r/100+1))+1000=0
We multiply all the terms by the denominator
-(800(r+1000*100+1))=0
We calculate terms in parentheses: -(800(r+1000*100+1)), so:We get rid of parentheses
800(r+1000*100+1)
We add all the numbers together, and all the variables
800(r+100001)
We multiply parentheses
800r+80000800
Back to the equation:
-(800r+80000800)
-800r-80000800=0
We move all terms containing r to the left, all other terms to the right
-800r=80000800
r=80000800/-800
r=-100001
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