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1=4r-15
We move all terms to the left:
1-(4r-15)=0
We get rid of parentheses
-4r+15+1=0
We add all the numbers together, and all the variables
-4r+16=0
We move all terms containing r to the left, all other terms to the right
-4r=-16
r=-16/-4
r=+4
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