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(8r-6)-(7r+3)=180
We move all terms to the left:
(8r-6)-(7r+3)-(180)=0
We get rid of parentheses
8r-7r-6-3-180=0
We add all the numbers together, and all the variables
r-189=0
We move all terms containing r to the left, all other terms to the right
r=189
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