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8=2.5r=15
We move all terms to the left:
8-(2.5r)=0
We add all the numbers together, and all the variables
-(+2.5r)+8=0
We get rid of parentheses
-2.5r+8=0
We move all terms containing r to the left, all other terms to the right
-2.5r=-8
r=-8/-2.5
r=3+0.5/2.5
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