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(1+r)5=170/90
We move all terms to the left:
(1+r)5-(170/90)=0
We add all the numbers together, and all the variables
(r+1)5-(+170/90)=0
We multiply parentheses
5r+5-(+170/90)=0
We get rid of parentheses
5r+5-170/90=0
We multiply all the terms by the denominator
5r*90-170+5*90=0
We add all the numbers together, and all the variables
5r*90+280=0
Wy multiply elements
450r+280=0
We move all terms containing r to the left, all other terms to the right
450r=-280
r=-280/450
r=-28/45
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