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4(r-90)+4r=3400
We move all terms to the left:
4(r-90)+4r-(3400)=0
We add all the numbers together, and all the variables
4r+4(r-90)-3400=0
We multiply parentheses
4r+4r-360-3400=0
We add all the numbers together, and all the variables
8r-3760=0
We move all terms containing r to the left, all other terms to the right
8r=3760
r=3760/8
r=470
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