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105(4r-5)=180
We move all terms to the left:
105(4r-5)-(180)=0
We multiply parentheses
420r-525-180=0
We add all the numbers together, and all the variables
420r-705=0
We move all terms containing r to the left, all other terms to the right
420r=705
r=705/420
r=1+19/28
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