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-73=7-4r
We move all terms to the left:
-73-(7-4r)=0
We add all the numbers together, and all the variables
-(-4r+7)-73=0
We get rid of parentheses
4r-7-73=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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