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2+5r=-4+2r
We move all terms to the left:
2+5r-(-4+2r)=0
We add all the numbers together, and all the variables
5r-(2r-4)+2=0
We get rid of parentheses
5r-2r+4+2=0
We add all the numbers together, and all the variables
3r+6=0
We move all terms containing r to the left, all other terms to the right
3r=-6
r=-6/3
r=-2
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