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