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3120.00=3000(1+0.5r)
We move all terms to the left:
3120.00-(3000(1+0.5r))=0
We add all the numbers together, and all the variables
-(3000(0.5r+1))+3120.00=0
We add all the numbers together, and all the variables
-(3000(0.5r+1))+3120=0
We calculate terms in parentheses: -(3000(0.5r+1)), so:We get rid of parentheses
3000(0.5r+1)
We multiply parentheses
0r+3000
We add all the numbers together, and all the variables
r+3000
Back to the equation:
-(r+3000)
-r-3000+3120=0
We add all the numbers together, and all the variables
-1r+120=0
We move all terms containing r to the left, all other terms to the right
-r=-120
r=-120/-1
r=+120
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