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4r=8/128
We move all terms to the left:
4r-(8/128)=0
We add all the numbers together, and all the variables
4r-(+8/128)=0
We get rid of parentheses
4r-8/128=0
We multiply all the terms by the denominator
4r*128-8=0
Wy multiply elements
512r-8=0
We move all terms containing r to the left, all other terms to the right
512r=8
r=8/512
r=1/64
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