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73=10+9r
We move all terms to the left:
73-(10+9r)=0
We add all the numbers together, and all the variables
-(9r+10)+73=0
We get rid of parentheses
-9r-10+73=0
We add all the numbers together, and all the variables
-9r+63=0
We move all terms containing r to the left, all other terms to the right
-9r=-63
r=-63/-9
r=+7
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