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48+2r=-8r+8
We move all terms to the left:
48+2r-(-8r+8)=0
We get rid of parentheses
2r+8r-8+48=0
We add all the numbers together, and all the variables
10r+40=0
We move all terms containing r to the left, all other terms to the right
10r=-40
r=-40/10
r=-4
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