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302=124+r
We move all terms to the left:
302-(124+r)=0
We add all the numbers together, and all the variables
-(r+124)+302=0
We get rid of parentheses
-r-124+302=0
We add all the numbers together, and all the variables
-1r+178=0
We move all terms containing r to the left, all other terms to the right
-r=-178
r=-178/-1
r=+178
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