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-69-88=-83r+80
We move all terms to the left:
-69-88-(-83r+80)=0
We add all the numbers together, and all the variables
-(-83r+80)-157=0
We get rid of parentheses
83r-80-157=0
We add all the numbers together, and all the variables
83r-237=0
We move all terms containing r to the left, all other terms to the right
83r=237
r=237/83
r=2+71/83
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