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(2r+3)89=180
We move all terms to the left:
(2r+3)89-(180)=0
We multiply parentheses
178r+267-180=0
We add all the numbers together, and all the variables
178r+87=0
We move all terms containing r to the left, all other terms to the right
178r=-87
r=-87/178
r=-87/178
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