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75=4r-5
We move all terms to the left:
75-(4r-5)=0
We get rid of parentheses
-4r+5+75=0
We add all the numbers together, and all the variables
-4r+80=0
We move all terms containing r to the left, all other terms to the right
-4r=-80
r=-80/-4
r=+20
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