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4163.25=3900(1+0.75r)
We move all terms to the left:
4163.25-(3900(1+0.75r))=0
We add all the numbers together, and all the variables
-(3900(0.75r+1))+4163.25=0
We calculate terms in parentheses: -(3900(0.75r+1)), so:We get rid of parentheses
3900(0.75r+1)
We multiply parentheses
0r+3900
We add all the numbers together, and all the variables
r+3900
Back to the equation:
-(r+3900)
-r-3900+4163.25=0
We add all the numbers together, and all the variables
-1r+263.25=0
We move all terms containing r to the left, all other terms to the right
-r=-263.25
r=-263.25/-1
r=263+0.25/1
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