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.8(r+3)=+2.2r
We move all terms to the left:
.8(r+3)-(+2.2r)=0
We multiply parentheses
0.8r-(+2.2r)+2.4=0
We get rid of parentheses
0.8r-2.2r+2.4=0
We add all the numbers together, and all the variables
-1.4r+2.4=0
We move all terms containing r to the left, all other terms to the right
-1.4r=-2.4
r=-2.4/-1.4
r=1+1/1.4
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