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128=8r+8
We move all terms to the left:
128-(8r+8)=0
We get rid of parentheses
-8r-8+128=0
We add all the numbers together, and all the variables
-8r+120=0
We move all terms containing r to the left, all other terms to the right
-8r=-120
r=-120/-8
r=+15
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