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r-5=-4r+15
We move all terms to the left:
r-5-(-4r+15)=0
We get rid of parentheses
r+4r-15-5=0
We add all the numbers together, and all the variables
5r-20=0
We move all terms containing r to the left, all other terms to the right
5r=20
r=20/5
r=4
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