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3+3r=10+4r
We move all terms to the left:
3+3r-(10+4r)=0
We add all the numbers together, and all the variables
3r-(4r+10)+3=0
We get rid of parentheses
3r-4r-10+3=0
We add all the numbers together, and all the variables
-1r-7=0
We move all terms containing r to the left, all other terms to the right
-r=7
r=7/-1
r=-7
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