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-5(1-5r)=170
We move all terms to the left:
-5(1-5r)-(170)=0
We add all the numbers together, and all the variables
-5(-5r+1)-170=0
We multiply parentheses
25r-5-170=0
We add all the numbers together, and all the variables
25r-175=0
We move all terms containing r to the left, all other terms to the right
25r=175
r=175/25
r=7
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