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-6-20+20r=-1+15r
We move all terms to the left:
-6-20+20r-(-1+15r)=0
We add all the numbers together, and all the variables
20r-(15r-1)-6-20=0
We add all the numbers together, and all the variables
20r-(15r-1)-26=0
We get rid of parentheses
20r-15r+1-26=0
We add all the numbers together, and all the variables
5r-25=0
We move all terms containing r to the left, all other terms to the right
5r=25
r=25/5
r=5
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